If you want to become a chemist, you will have to ruin your health. If you don't ruin your health studying, you won't accomplish anything these days in chemistry. Liebig's advice to Kekulé.
Genius, with all its pride in its own strength, is but a dependent quality, and cannot put forth its whole powers nor claim all its honors without an amount of aid from the talents and labors of others which it is difficult to calculate.