To live remains an art which everyone must learn, and which no one can teach.

At the present day the crude theory of the sexual impulse held on one side, and the ignorant rejection of theory altogether on the other side, are beginning to be seen as both alike unjustified.

Still, whether we like it or not, the task of speeding up the decrease of the human population becomes increasingly urgent.

...aesthetic values are changed under the influence of sexual emotion; from the lover's point of view many things are beautiful which are unbeautiful from the point of view of him who is not a lover, and the greater the degree to which the lover is swayed by his passion the greater the extent to which his normal aesthetic standard is liable to be modified.

The greatest task before civilization at present is to make machines what they ought to be, the slaves, instead of the masters of men.

Birth-control is effecting, and promising to effect, many functions in our social life.

Imagination is a poor substitute for experience.