Here are a various tips, you may want to add some more...
"The beginning and end of Torah is performing acts of loving kindness."
"The best portions of a good man's life, his little, nameless, unremembered acts, of kindness and love."
"Kindness can become its own motive. We are made kind by being kind."
"Compassion is the chief law of human existence."
"Kindness is more important than wisdom, and the recognition of this is the beginning of wisdom."
~Theodore Isaac Rubin
"Kindness is an inner desire that makes us want to do good things even if we do not get anything in return. It is the joy of our life to do them. When we do good things from this inner desire, there is kindness in everything we think, say, want and do."
~ Emmanuel Swedenborg
"One who knows how to show and to accept kindness will be a friend better than any possession. Kindness gives birth to kindness."
"You can accomplish by kindness what you cannot do by force."
"What wisdom can you find that is greater than kindness?"
~Jean Jacques Rousseau
"If we make our goal to live a life of compassion and unconditional love, then the world will indeed become a garden where all kinds of flowers can bloom and grow."
"The person who doesn't fit in with our notions of who is worthy of our love – the bag lady at the corner, the strange old man who rides through town on a three-wheel bike all strung up with flags -- is just the person who, by not fitting into our patterns, insists that we expand not only our views but also our capacity to love. Today, see if you can stretch your heart and expand your love so that it touches no only those to whom you can give it easily, but also to those who need it so much."
~Daphne Rose Kingma
"Much violence is based on the illusion that life is a property to be defended and not to be shared."
"Let us be kinder to one another."
~Aldous Huxley, on his deathbed
"My religion is very simple. My religion is kindness."
~The Dalai Lama
"Compassionate the mountains rise dim with the wistful dimness of old eyes that, having looked on life time out of mind, know that the simple gift of being kind is greater than all the wisdom of the wise."
"Waste no more time arguing what a good man should be. Be one!"
"Kindness does not cost anything, give all you can"