Tell me what you feel in your room when the full moon is shining in upon you and your lamp is dying out, and I will tell you how old you are, and I shall know if you are happy.

There is no repose for the mind except in the absolute; for feeling, except in the infinite; for the soul, except in the divine.

Philosophy starts with doubt and loves only truth.

Mozart has the classic purity of light and the blue ocean; Beethoven the romantic grandeur which belongs to the storms of air and sea, and while the soul of Mozart seems to dwell on the ethereal peaks of Olympus, that of Beethoven climbs shuddering the storm-beaten sides of a Sinai. Blessed be they both! Each represents a moment of the ideal life, each does us good. Our love is due to both.

Knowledge, love, power-there is the complete life.

Let us be true: this is the highest maxim of art and of life, the secret of eloquence and of virtue, and of all moral authority.

Happiness gives us the energy which is the basis of health.