Were we fully to understand the reasons for other people's behavior, it would all make sense.

Religion originates in the child's and young mankind's fears and need for help. It cannot be otherwise.

Writing was in its origin, the voice of an absent person.

Religion belonged to the infancy of humanity. Now that humanity had come of age, it should be left behind.

Religion [is] the universal obsessional neurosis of humanity

dream is the dreamer's own psychical act.

It is unreasonable to expect science to produce a system of ethics-ethics are a kind of highway code for traffic among mankind-and the fact that in physics atoms which were yesterday assumed to be square are now assumed to be round is exploited with unjustified tendentiousness by all who are hungry for faith; so long as physics extends our dominion over nature, these changes ought to be a matter of complete indifference to you.