Shut out all of your past except that which will help you weather your tomorrows. — Sir William Osler. Canadian physician and co-founder of Johns Hopkins Hospital (1849–1919)
To study the phenomenon of disease without books is to sail an uncharted sea, while to study books without patients is not to go to sea at all.
Live neither in the past nor in the future, but let each day's work absorb your entire energies, and satisfy your widest ambition.