'Worthwhile' in the Bible

I thought to myself, "Come now, I will try self-indulgent pleasure to see if it is worthwhile." But I found that it also is futile.

Because of this, the Lord said, "You must repent of such words and thoughts! If you do, I will restore you to the privilege of serving me. If you say what is worthwhile instead of what is worthless, I will again allow you to be my spokesman. They must become as you have been. You must not become like them.