This is from Process of the 3 Falls of the Souls:

(...) Gradually, a new culture came into being on Earth, a civilisation that brought forth an unprecedented technological development which affected all parts of society. I would like to say a little more about the kind of technology that evolved in Atlantis. What you as ‘star people’ still remembered brightly, despite the veil of forgetfulness, was that you can influence material reality by using the power of your mind, specifically the third eye. The third eye is the energy centre (chakra) of intuition and psychic awareness, and it is located behind your two physical eyes.

The power of the third eye was still very familiar to you in those first incarnations, like a second nature to your soul. You knew ‘how it worked’. You knew that matter (physical reality) has a form of consciousness, is consciousness in a certain state of being. Through this essential insight into the oneness of consciousness and matter, you could affect and form matter, by making inner contact with the consciousness in the piece of matter. In this way, you could literally move matter, manipulate it from the mind. You knew a secret that was forgotten in more recent times.

Presently, you see matter (physical reality) as separated from consciousness (the mind). Influenced by modern science, you have forgotten that all beings are ensouled: all that is has some form of consciousness that you can connect with and cooperate with in a creative way. This knowledge was self evident to you in those ancient times. But, during Atlantis, when your heart centres had not been awakened fully, your third eye was predominantly controlled by the centre of the will or ego (the solar plexus or third chakra). You stood on the doorway of a new inner reality, the reality of heart-based consciousness, but due to the shock of being submerged in the dense reality of Earth, your tender and fresh inspirations got lost temporarily. You allowed yourselves to be led astray by the excessive use of the will mixed with the power of the third eye. You did aspire to make things better on a larger scale (‘lightwork’) but you did it in a self-centered way, with an authoritarian attitude toward the Earth souls and nature.

In the hey-day of Atlantis, there were many possibilities and the technology was highly advanced, in some areas even more than your present technology, because the power of telepathy and psychic manipulation was much better used and understood. Instantaneous, telepathic communication could take place between different persons at great distance from each other. It was possible to leave your body consciously and travel around. Communication with extraterrestrial civilisations was pursued and effected.

Much became possible during Atlantis, but much went wrong as well. There generally was a divide between the political-spiritual elite and the ‘common people’, which were made up of Earth souls predominantly. They were looked upon as inferior beings, means to an end, and they were actually used for genetic experiments that were part of the Atlantean ambition to manipulate life on the biological level, so that more superior life forms could be created.

A positive aspect of the Atlantean society, by the way, was the equality of men and women during that age. The power struggle of man and woman, in which women were horribly oppressed during the last stage, was not a part of Atlantis. The feminine energy was fully respected, especially because it is directly related to the power of the third eye (intuition, clairvoyance, spiritual power).

I now wish to take you to the downfall of Atlantis. Energies were at work there that you are still trying to come to terms with. You were deeply involved in what went wrong at that stage.
In Atlantis, you lived from the centres of the will and the third eye. Your heart energy did not open up significantly. At a certain point, you fell in love with the possibilities of your own technology and the ambition of creating more superior life forms. You applied genetic engineering and experimented on several life forms, and you were unable to understand, to feel, that you were disrespectful to Life in this. The ones you experimented upon could not count on your empathy and compassion.

The energy present at this stage of perversion in the Atlantean civilisation specifically returned in the 20th century as the Nazi regime in Germany. Cruel experimenting and a general attitude of clinical coldness towards ‘inferior life forms’ was a substantial part of that regime. The lack of compassion and empathy displayed towards the perpetrated, the lack of emotion and the mechanical way of ‘dealing with’ the victims, was similar to the Atlantean attitude. This now fills you with a deep sense of horror. You have seen and felt the other side of it, the victim side, in lifetimes that came after Atlantis.

But during Atlantis, you were the offender. That’s where a particular ‘karma’ ensued. Atlantis is the key to your ‘offender lifetimes’, your dark side. I’m telling you this, not to make you feel ashamed or guilty, not at all. We are all part of this history, taking on various roles and disguises, and this is what it is like to be in duality. It is to experience and play all thinkable roles, from very light to very dark. If you allow yourself to know your dark side, if you can accept that you played the role of perpetrator as well, you will be more balanced, free and joyful. That is why I tell you this.
At one point, the technological developments that you - and other soul groups - pursued, had such a great impact upon nature, that the ecological systems on Earth got disrupted. The downfall of Atlantis did not take place all at once. There were many warning signs - nature’s beckoning - but when they were not heeded, enormous natural disasters occurred through which the Atlantean civilisation got flooded and destructed.

How did it affect you on the inner level? It was a shocking experience, a traumatic experience; it was another Fall, a second Fall of Experience into the deep.

During your incarnations on Earth, you had eventually lost the connection to the heart energy that you had reached out to. Stronger than ever, you realized after the downfall of Atlantis that truth was not to be found in the controlling of life, even if the purpose seemed noble. You then really began to open up to the still voice of the heart, which tells you that there is a wisdom working through Life itself, that needs no managing or controlling. In the flow of life itself, in the flow of the heart and the feelings, there is a wisdom that you can attune to, or align with, by listening and surrendering. It is not a wisdom created from the head or by the will, it is a wisdom that comes from allowing in a higher perspective, the voice of love.

This mystical knowing, which is accompanied by a sense of humbleness and surrender, you slowly started to feel from within. But even then, the time was not yet ripe for a joyful awakening of the heart energies. A shadow had fallen upon you during Atlantis, the shadow of having affected other beings negatively. The effects of this would have to be deeply felt and experienced by you before the awakening could take place.

Again I take another huge step in this old history, and I take you to the moment you return to Earth, after Atlantis had vanished, washed away by ocean waves. Once again you incarnated in human bodies, the memory of Atlantis buried deep within your soul memory, tied with a sense of shame and self-doubt. The downfall of Atlantis had stunned and perplexed you, but it had also opened up your hearts a little wider.

What immense developments taking place on such a grand scale of time!