Be thine own palace, or the world's thy jail.
If you can dream it, you can do it.
Know or listen to those who know.
The secret of getting ahead is getting started.
Do not weep do not wax indignant. Understand.
Things do not happen. Things are made to happen.
Leap, and the net will appear.
I can, therefore I am.
What you do today can improve all your tomorrows.
The wise does at once what the fool does at last.
The grounding in natural sciences which I obtained in the course of my medical studies, including preliminary examinations in botany, zoology, physics, and chemistry, was to become decisive in determining the trend of my literary work.