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Catholic traditions often reach deep into the Jewish roots of the faith and the answer to this question might be best supplied by looking at the Jewish teachings on Caleb who was asked to reconnoiter the land of Canaan and report back to Moses.
As we know, Caleb is the lone voice of optimism for the potential taking of the land.
In the Jewish faith these men and women (such as the Patriarchs and Matriarchs) are called "Righteous" wherein a similar comparison could be made to the men and women of heaven that Catholics call "Saints."