This begets a magnanimity and a rational confidence which cannot otherwise be obtained.

She had married a man in whose worth, affection, and manliness of character, she could repose a rational confidence.

Of him we may say with more rational confidence what was said of that more potent and more truculent satirist:

There is no one affliction of mortality more easily and certainly reducible, with a little patience, and a rational confidence in the physician.