Profit without purpose is chemistry without catalysts - possible, but painfully slow and inefficient.
I can't go on, I'll go on.
Psychology is a science, and teaching is an art; and sciences never generate arts directly out of themselves.
History is not the past. It is the present. We carry our history with us.
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.
Innovation is the eternal driving force of enterprise development, without innovation there is no future.
Mathematics is the language with which God has written the universe.
The creative process is a form of meditation.