Acts 1:24 - Clarke's commentary and critical notes on the Bible

And they prayed, and said, Thou, Lord, which knowest the hearts of all men, shew whether of these two thou hast chosen, Thou Lord, which knowest the hearts - Συ, κυριε, καρδιογνωστα. The word καρδιογνωστης, the searcher of hearts, seems to be used here as an attribute of God; he knows the hearts, the most secret purposes, intentions, and dispositions of all men; and because he is the knower of hearts, he knew which of these men he had qualified the best, by natural and gracious dispositions and powers, for the important work to which one of them was now to be appointed.