Cheerfulness is the health of a harmonious soul. A soul affected by some vice cannot be cheerful.
— Hryhoriy Skovoroda
When male and female combine, all things achieve harmony.
—Laozi
If only the whole world could feel the power of harmony.
—Wolfgang Amadeus Mozart
Musical training is a more potent instrument than any other, because rhythm and harmony find their way into the inward places of the soul.
—Plato
The unlike is joined together, and from differences results the most beautiful harmony.
—Heraclitus
How is it they live in such harmony, the billions of stars, when most men can barely go a minute without declaring war in their minds?
—Thomas Aquinas
Opposition brings concord. Out of discord comes the fairest harmony.
—Heraclitus