Job 32:8-9 NKJV
But there is a spirit in man, and the breath of the Almighty gives him understanding. Great men are not always wise, nor do the aged always understand justice.
Job 38:36 NKJV
Who has put wisdom in the mind? Or who has given understanding
Elihu points out in his speech to Job and his 3 older friends that understanding does not automatically come with age. You could live a long time and be stupid as an old person. You could be an old fool like Madeline Murray O’Hare who claimed to be an atheist and single-handedly removed prayer and Bible reading from the public school system. Then in Job 38:6, God asks Job who is the one who gives understanding. If we have understanding we received it from God and we are therefore responsible to act on it. If we want to be sure we have understanding and not just knowledge we must buddy up with God. We must spend time with Him, asking Him questions and listening to Him.