Go for it now. The future is promised to no one.
After a storm comes a calm.
Who seeks shall find.
Be kind whenever possible. It is always possible.
The wise does at once what the fool does at last.
The most effective way to do it, is to do it.
Always desire to learn something useful.
It's always too early to quit.
Well done is better than well said.
If you're going through hell, keep going.
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.