If you want to have sustained joy, you have to not only make sure that you think right, but you also have to make decisions now that are going to guarantee some joy in the future.
I've been saying for a couple of years now that people need to let God out of the Sunday morning box, that He doesn't want to just be with you for an hour or two on Sunday morning and then put back in His box to sit there until you have an emergency, but He wants to invade your Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, and Sunday.