Psalms 16:7

Given me counsel... — i.e., led me to a right and happy choice of the way of life.

My reins — i.e., my heart.

Instruct me. — Better, warn me. Conscience echoes the voice of God. The Hebrew word, from a root meaning bind, includes the sense of obligation. Once heard, the Divine monition becomes a law to the good man, and his own heart warns him of the slightest danger of deviation from it.