The connection between sane living and sound work is a physiological and psychological necessity.

Outsider art is folk, self-taught, naive or visionary, sometimes driven by psychological necessity.

"It is a psychological necessity for us."

Does he decry the notion of homeland or argue for its psychological necessity?

Of course, this can lead to rather over-obvious themes, but this psychological necessity is a factor we cannot ignore.

That one can do without it makes the small luxury into a psychological necessity.

Some in the younger generation describe the job of learning about the Holocaust, and carrying on its memory, as a psychological necessity.

He was making himself useful, which had always been his way, but which since the shooting had become a psychological necessity.

Not as efficient, but probably a psychological necessity.

For him, at least, some way of harmonizing the spiritual with the material was a psychological necessity.