Morally justified means something which has been done with a belief that it is the correct thing to do. This is true even if something may not be the best decision otherwise.

The study of knowledge and justified belief.

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True belief is faith. But belief is not a solid as faith. Hope that helps a little.

The first comprehensive theory of knowledge was developed by the ancient Greek philosopher Plato. In his dialogue "Theaetetus," Plato explores the nature of knowledge as justified true belief.