'Well spring' in the Bible

Passing through the valley of Baca, they make it a well-spring; yea, the early rain covereth it with blessings.

Keep your heart with all diligence, for out of it is the wellspring of life.

Understanding is a wellspring of life unto him that hath it: but the instruction of fools is folly.

The words of a man's mouth are as deep waters, and the wellspring of wisdom as a flowing brook.