A model should be as simple as it can be but no simpler

The problems that exist in this world can not be solved by the level of thinking that created them.

I always found I was in the best of company, alone.

A forced faithfulness is a bitter fruit for all concerned.

I believe that whoever tries to think things through honestly will soon recognize how unworthy and even fatal is the traditional bias against Negroes. What can the man of good will do to combat this deeply rooted prejudice? He must have the courage to set an example by words and deed, and must watch lest his children become influenced by racial bias.

It is the same with people as it is with riding a bike. Only when moving can one comfortably maintain one's balance.

One must take what nature gives as one finds it.