Tyndale House Publishers found evidence that reading the Bible promotes a positive outlook. According to a study they commissioned with the Barna Research Group:

Eighty-two percent of regular Bible readers described themselves as "at peace" compared to 58 percent of those who said they never read the Bible.

Seventy-eight percent of regular Bible readers said they felt "happy" all or most of the time compared to 67 percent of nonreaders.

Sixty-eight percent of regular Bible readers said they were "full of joy" compared to 44 percent who said they never read the Bible.