Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

Of all forms of caution, caution in love is perhaps the most fatal to true happiness.

Machines have altered our way of life, but not our instincts. Consequently, there is maladjustment.

Men who allow their love of power to give them a distorted view of the world are to be found in every asylum: one man will think he is the Governor of the Bank of England, another will think he is the King, and yet another will think he is God. Highly similar delusions, if expressed by educated men in obscure language, lead to professorships of philosophy; and if expressed by emotional men in eloquent language, lead to dictatorships.

Organic life, we are told, has developed gradually from the protozoon to the philosopher, and this development, we are assured, is indubitably an advance. Unfortunately it is the philosopher, not the protozoon, who gives us this assurance.

Thought is merciless to privilege, established institutions, and comfortable habit.

...the nonexistence of God makes more difference to some of us than to others. To me, it means that there is no absolute morality, that moralities are sets of social conventions devised by humans to satisfy their needs.