'Mind' in the Bible

Indeed, all of his days are filled with sorrow, and his struggles bring grief. In fact, his mind remains restless throughout the night. This is pointless, too!

Whenever a sentence for a crime is not carried out swiftly, the human mind becomes determined to commit evil.

So enjoy yourself in your youth, young man, and be encouraged during your younger days. Live as you like, consistent with your world view, but keep in mind that God will bring you to account for everything.