No one gossips about other people's secret virtues.

Man can be scientifically manipulated.

Love as a relation between men and women was ruined by the desire to make sure of the legitimacy of children.

The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice. If you take your children for a picnic on a doubtful day, they will demand a dogmatic answer as to whether it will be fine or wet, and be disappointed in you when you cannot be sure.

The harm that theology has done is not to create cruel impulses, but to give them the sanction of what professes to be lofty ethic, and to confer an apparently sacred character upon practices which have come down from more ignorant and barbarous times.

Change is one thing, progress is another.

The only thing that will redeem mankind is cooperation.