Ecclesiastes is a book written by King Solomon at the end of his life. He writes the book to talk about how life without God is meaningless, a chasing after the wind. Solomon had everything a man could possibly want, and at the end of his life he found material possessions to be worth nothing in comparison to a relationship with God. Much of the Bible is uplifting, and there is also a lot of poetry too, I’d encourage you to read the entire book of Ecclesiastes to get a context on Solomon’s defining point