This is interesting:
So is this:
Throughout the war, he carried with him a copy of the 91st Psalm, a gift from his father. According to the Jimmy Stewart Museum, he said, "What a promise for an airman. I placed in His Hands the squadron I would be leading. And, as the psalmist promised, I felt myself borne up." Psalm 91 He that dwelleth in the secret place of the most High shall abide under the shadow of the Almighty. I will say of the LORD, He is my refuge and my fortress: my God; in him will I trust. Surely he shall deliver thee from the snare of the fowler, and from the noisome pestilence. He shall cover thee with his feathers, and under his wings shalt thou trust: his truth shall be thy shield and buckler. Thou shalt not be afraid for the terror by night; nor for the arrow that flieth by day; Nor for the pestilence that walketh in darkness; nor for the destruction that wasteth at noonday. A thousand shall fall at thy side, and ten thousand at thy right hand; but it shall not come nigh thee. Only with thine eyes shalt thou behold and see the reward of the wicked. Because thou hast made the LORD, which is my refuge, even the most High, thy habitation; There shall no evil befall thee, neither shall any plague come nigh thy dwelling. For he shall give his angels charge over thee, to keep thee in all thy ways. They shall bear thee up in their hands, lest thou dash thy foot against a stone. Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet. Because he hath set his love upon me, therefore will I deliver him: I will set him on high, because he hath known my name. He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him. With long life will I satisfy him, and shew him my salvation.
Remember the scene near the end of It's a Wonderful Life, where Jimmy Stewart, playing the role of George Bailey, breaks down in a pub, crying out to God in utter despair? (Watch the scene here; fast-forward to the 5:30 mark.) Apparently Stewart wasn't really acting; those tears were real. In this 1977 article that Stewart wrote for Guideposts, the actor recalls that George "is unaware that most of the people in town are arduously praying for him. In this scene, at the lowest point in George Bailey's life, Frank Capra was shooting a long shot of me slumped in despair. In agony I raise my eyes and following the script, plead, 'God...God...dear Father in heaven, I'm not a praying man, but if You're up there and You can hear me, show me the way, I'm at the end of my rope. Show me the way, God...' "As I said those words, I felt the loneliness and hopelessness of people who had nowhere to turn, and my eyes filled with tears. I broke down sobbing. This was not planned at all, but the power of that prayer, the realization that our Father in heaven is there to help the hopeless had reduced me to tears." In the article, Stewart further discusses the making of the film, his faith, and how his dad held him accountable to attend church once he moved to LA from little Indiana, Pennsylvania. A good read about a fine man and a classic movie.
Maybe he was trying to make up for "not doing enough" in his own mind? Who knows.
Compare that to the typical Hollywood actor these days.