All along we find that social life - religion, politics, art - reflects the stages reached in the development of the knowledge of self it shows the social uses made of this knowledge.

Einstein's results again turned the tables and now very few philosophers or scientists still think that scientific knowledge is, or can be, proven knowledge.

As the body dieth when the soul departeth, so the soul of man dieth, when it hath not the knowledge of God.

The word of God is full of sad and grave counsel, full of the knowledge of God, of examples of virtues, and of correction of vices, of the end of this life, and of the life to come.

Human knowledge is dark and uncertain philosophy is dark, astrology is dark, and geometry is dark.