A horror movie from the early 1980s or maybe late 1970s?

I'm trying to remember the name of a horror movie I saw when I was a child. I remember very little of it. I can remember that in the first scene, a young man fills his pockets up with stones and walks into the ocean, trying to kill himself.

The young man finds himself in a hospital. I think he has visions, or something.

In another scene, the same young man (I think) drives away in a pickup truck with his mother (I think?), and there is a sign with a Bible verse on it. This scene may have been a vision.

That's about all I remember.