Which knoweth the heart (καρδιογνωστης). Late word from καρδια (heart) and γνωστης (known, γινωσκω). In the N.T. only here and 1:2…

And God, who knows the hearts (Acts 1:24). God thus knew whether they were true converts or not, and gave a demonstra…

God which knoweth the hearts.—We note the recurrence of the epithet as characteristic of St. Peter. (See Note on Acts 1:…

Peter was no longer the chief figure of the Jerusalem church, for James had now assumed that role (cf. comment on 12:17). But Peter was dominant in…

And God which knoweth the hearts
Of all men; he being omniscient, the searcher of the hearts, and the trier of the r…

We see from the words purifying their hearts by faith, and the address of Saint Peter, that justification by faith and sanctification by t…