Jewish Heroes and Prophets, from Lord's Lecture, Beacon Lights of History, volume 2
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From the first chapter: "From a religious point of view, Abraham appears to us, after the lapse of nearly four thousand years, as the most august character in history. He may not have had the genius and learning of Moses, nor his executive ability; but as a religious thinker, inspired to restore faith in the world and the worship of the One God, it would be difficult to find a man more favored or more successful. He is the spiritual father equally of Jews, Christians, and Mohammedans, in their warfare with idolatry. In this sense, he is the spiritual progenitor of all those nations, tribes, and peoples who now acknowledge, or who may hereafter acknowledge, a personal God, supreme and eternal in the universe which He created."