Verses for understanding is

For if I pray in an unknown tongue, my spirit prayeth, but my understanding is unfruitful.

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

He that hath knowledge spareth his words: and a man of understanding is of an excellent spirit.

The prince that wanteth understanding is also a great oppressor: but he that hateth covetousness shall prolong his days.

Great is our Lord, and of great power: his understanding is infinite.