A man is sane morally at thirty, rich mentally at forty, wise spiritually at fifty-or never!

Live neither in the past nor in the future, but let each day's work absorb your entire energies, and satisfy your widest ambition.

The hardest conviction to get into the mind of a beginner is that the education upon which he is engaged is not a college course, not a medical course, but a life course, for which the work of a few years under teachers is but a preparation.

Let each hour of the day have its allotted duty, and cultivate that power of concentration which grows with its exercise.

The future belongs to Science. More and more she will control the destinies of the nations. Already she has them in her crucible and on her balances.

Be calm and strong and patient. Meet failure and disappointment with courage. Rise superior to the trials of life, and never give in to hopelessness or despair. In danger, in adversity, cling to your principles and ideals. Aequanimitas!

The great minds, the great works transcend all limitations of time, of language, and of race, and the scholar can never feel initiated into the company of the elect until he can approach all of life's problems from the cosmopolitan standpoint.