The most important knowledge is that which guides the way you lead your life.

The only absolute knowledge attainable by man is that life is meaningless.

He that would enjoy life and act with freedom must have the work of the day continually before his eyes. Not yesterday's work, lest he fall into despair, nor tomorrow's, lest he become a visionary, nor that which ends with the day, which is a worldly work, nor yet that only which remains to eternity, for by it he cannot shape his actions.

Spirit is the life that itself cuts into life: with its own torment it increases its own knowledge. Did you already know that?

The future of life as we know it is being determined by everything we're doing-and not doing.

All knowledge which ends in words will die as quickly as it came to life, with the exception of the written word: which is its mechanical part.