It is true that the grasping of truth is not possible without empirical basis. However, the deeper we penetrate and the more extensive and embracing our theories become the less empirical knowledge is needed to determine those theories.

The thinking it took to get us into this mess is not the same thinking that is going to get us out of it.

Most teachers waste their time by asking question which are intended to discover what a pupil does not know whereas the true art of questioning has for its purpose to discover what pupils knows or is capable of knowing.

Striving for social justice is the most valuable thing to do in life.

Human knowledge and skills alone cannot lead humanity to a happy and dignified life. Humanity has every reason to place the proclaimers of high moral standards and values above the discoverers of objective truth.

You have to learn the rules of the game. And then you have to play better than anyone else.

The only thing we can be certain of in this life is that we can be certain of nothing.