Felix Frankfurter, a famous judge of U.S.A. Supreme Court of Justice, wrote this letter to a young man he knew, who wanted to become a lawyer.
I read it today, but these words have been my rule of life in the last ten years.

"My dear Paul,
No one can be a truly competent lawyer unless he is a cultivated man. If I were you, I would forget about any technical preparation for the law. The best way to prepare for the law is to come to the study of law as a well-read person. Thus alone can one acquire the capacity to use the English language on paper and in speech and with the habits of clear thinking which only a truly liberal education can give. No less important for a lawyer is the cultivation of the imaginative faculties by reading poetry, seeing great paintings ... and listening to great music. Stock your mind with the deposit of much good reading, and widen and deepen your feelings by experiencing vicariously as much as possible the wonderful mysteries of the universe, and forget all about your future career.
With good wishes,
Sincerely yours,
Felix Frankfurter"