Character is built out of circumstances. From exactly the same materials, one man builds palaces, while another builds hovels.

A cell is regarded as the true biological atom.

Ideas are forces; our acceptance of one determines our reception of others.

Originality is independence, not rebellion; it is sincerity, not antagonism.

No man ever made a great discovery without the exercise of the imagination.

The magic of the pen lies in the concentration of your thoughts upon one object.

Science is the systematic classification of experience.