Vigorous

Definitions: (1) living or growing with full vital strength;  heartsome; robust; (2) acting with abundant energy and force; powerful

Quotes:
• Knowledge is not a passion from without the mind, but an active exertion of the inward strength, vigor and power of the mind, displaying itself from within. — Ralph Cudworth (1617–1688) English philosopher & theologian
• If you will call your troubles experiences, and remember that every experience develops some latent force within you, you will grow vigorous and happy, however adverse your circumstances may seem to be. — John Heywood (c. 1497–1580) English writer

Color: red

Symbol: the hippopotamus (Egyptian)