Ecclesiastes 1:16
"I communed with mine own heart, saying, Lo, I am come to great estate, and have gotten more wisdom than all they that have been before me in Jerusalem: yea, my heart had great experience of wisdom and knowledge."
Cross References (ranked by relevance)
So I was great, and increased more than all that were before me in Jerusalem: also my wisdom remained with me.
And Solomon’s wisdom excelled the wisdom of all the children of the east country, and all the wisdom of Egypt.
Howbeit I believed not the words, until I came, and mine eyes had seen it: and, behold, the half was not told me: thy wisdom and prosperity exceedeth the fame which I heard.
Stand in awe, and sin not: commune with your own heart upon your bed, and be still. Selah.
Huram said moreover, Blessed be the LORD God of Israel, that made heaven and earth, who hath given to David the king a wise son, endued with prudence and understanding, that might build an house for the LORD, and an house for his kingdom.
But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
The king spake, and said, Is not this great Babylon, that I have built for the house of the kingdom by the might of my power, and for the honour of my majesty?
That saith, I will build me a wide house and large chambers, and cutteth him out windows; and it is cieled with cedar, and painted with vermilion.
But Gehazi, the servant of Elisha the man of God, said, Behold, my master hath spared Naaman this Syrian, in not receiving at his hands that which he brought: but, as the LORD liveth, I will run after him, and take somewhat of him.
I call to remembrance my song in the night: I commune with mine own heart: and my spirit made diligent search.