I will bless the LORD, who hath given me counsel: my reins also instruct me in the night seasons. Who hath given me counsel - Jesus, as man, received all his knowledge and wisdom from God; Luke 2:40-52. And in him were hidden all the treasures of wisdom and knowledge.
My reins also instruct me - כליותי kilyothai, reins or kidneys, which from their retired situation in the body, says Parkhurst, and being hidden in fat, are often used in Scripture for the most secret workings and affections of the heart.
The kidneys and their fat were always to be burnt in sacrifice, to indicate that the most secret purposes and affections of the soul are to be devoted to God.
In the night seasons - That is, in the time of my passion, my secret purposes and determinations concerning the redemption of man support me. "For the joy that was set before him he endured the cross, despising the shame;" Hebrews 12:2.