Think that all phenomena are like dreams.
Geshe Chekawa in the root text of Universal compassion
In dreams we can see and touch our dream world, but when we wake up we realize that it was simply a projection of our mind and had no existence outside our mind. In the same way, the world we see when we are awake is simply a projection of our mind and has no existence outside our mind.
Geshe Kelsang in Modern Buddhism
All the problems of human society, such as war, crime, pollution, drug addiction, poverty, injustice, and disharmony within families, are the result of self-cherishing. Thinking that human beings alone matter, and that the natural world exists to serve human desires, we have wiped out thousands of animal species and polluted the planet to such an extent that there is great danger it could soon be unfit even for human habitation. If everyone were to practise cherishing others, many of the major problems of the world would be solved in a few years.
Geshe Kelsang Gyatso in Eight Steps to Happiness and Transform Your Life
Self-cherishing is defined as a mind that considers oneself to be supremely important and precious, and that develops from the appearance of true existence of the self. The delusion of self-cherishing is functioning in our mind almost all the time, and is at the very core of our samsaric experience.
Geshe Kelsang Gyatso in Transform Your Life
All the happiness there is in this world
Arises from wishing others to be happy.
And all the suffering there is in this world
Arises from [self-importantly] wishing ourself to be happy.
Shantideva in Guide to the Bodhisattva's Way of Life
All these beings strongly desire happiness,
And humans cannot be happy without enjoyments.
Knowing these enjoyments come from giving
The Able one taught giving first.
Chandrakirti in Guide to the Middle Way (see Ocean of Nectar by Geshe Kelsang Gyatso)
We should try to become familiar with the life and works of Je Tsongkhapa and develop faith in him. 
He is not praised here just because he was the founder of the Gelug tradition, but on account of his excellence. If we were to study his works we would be astounded by their clarity and beauty, and we would understand that they are the works of a realized Master who has written honestly and sincerely about his own experiences. His teachings are said to have two special qualities: his teaching of Secret Mantra reveals the meaning of the Tantras unmistakenly and more clearly than others; and his special way of presenting the profound view cannot be found elsewhere. We cannot become convinced of this simply by listening to others; these special qualities can be understood only through study and practice.
Geshe Kelsang Gyatso in Joyful Path of Good Fortune
All of Geshe-la's books are available for purchase from Amitabha Centre.