To know oneself, one should assert oneself.
Do not weep do not wax indignant. Understand.
Always desire to learn something useful.
Know or listen to those who know.
To be a good loser is to learn how to win.
Without hard work, nothing grows but weeds.
It's always too early to quit.
What you do today can improve all your tomorrows.
If you're going through hell, keep going.
If you can dream it, you can do it.
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.