Darkness cannot drive out darkness: only light can do that. Hate cannot drive out hate: only love can do that.
A relationship is like a house. When a lightbulb burns out you do not go and buy a new house, you fix the lightbulb
We can easily forgive a child who is afraid of the dark; the real tragedy of life is when men are afraid of the light.
There is a single light of science, and to brighten it anywhere is to brighten it everywhere.