Ethical metaphysics is fundamentally an attempt, however disguised, to give legislative force to our own wishes.

Physics, owing to the simplicity of its subject matter, has reached a higher state of development than any other science.

When you meet with opposition, even if it should be from your husband or your children, endeavor to overcome it by argument and not by authority, for a victory dependent upon authority is unreal and illusory.

All knowledge, we feel, must be built up upon our instinctive beliefs; and if these are rejected, nothing is left.

Love can only flourish as long as it is free and spontaneous; it tends to be killed by the thought that it is a duty. To say that it is your duty to love so-and-so is the surest way to cause you to hate him or her.

We know too much and feel too little.

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.