Thy words were found, and I did eat them; and thy word was unto me the joy and rejoicing of mine heart… – Jeremiah 15:16

“Thy words were found.” As Jeremiah meant them, they signified this: that certain messages came to him most clearly from God, and he recognised them as such; he ascertained how far the thoughts which passed through his mind were originated by the Spirit of God, and how far they were from merely his own imaginings; he separated between the precious and the vile, and when he had found, discovered, and discerned God’s words, then it was that he fed upon it.

What is meant by finding God’s words? The expression suggests the mode. A thing found has usually been sought for. Happy is that man who reads the Scriptures and hears the word- searching all the while for the hidden spiritual sense, which is indeed the voice of God…Solomon tells us the method of finding the true wisdom, in that cheering word at the commencement of the second chapter of the Proverbs, “My son, if thou wilt incline thine ear to wisdom, and apply thine heart to understanding; yea, if thou criest after knowledge, and liftest up thy voice for understanding; if thou seekest her as silver, and searchest for her as for hid treasures; then shalt thou understand the fear of the Lord, and find the knowledge of God.” Though occasionally the Lord in His infinite sovereignty has been pleased to reveal His salvation to those who sought it not, according to His own word, “I am found of them that sought Me not,” yet there is no promise to this effect; the promise is to those who seek. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0980.cfm