The individual is not accountable to society for his actions in so far as these concern the interests of no person but himself.

What distinguishes the majority of men from the few is their inability to act according to their beliefs.

[A] man and still more the woman, who can be accused either of doing "what nobody does," or of not doing "what everybody does," is the subject of as much depreciatory remark as if he or she had committed some grave moral delinquency.

...to bring a child into existence without a fair prospect of being able, not only to provide food for its body, but instruction and training for its mind is a moral crime, both against the unfortunate offspring and against society

The habit of analysis has a tendency to wear away the feelings.

The application of algebra to geometry ... has immortalized the name of Descartes, and constitutes the greatest single step ever made in the progress of the exact sciences.

All action is for the sake of some end; and rules of action, it seems natural to suppose, must take their whole character and color from the end to which they are subservient.