“The Lord enjoins us to do good to all without exception, though the greater part, if estimated by the own merit, are most unworthy of it, but Scripture subjoins a most excellent reason, when it tells us that we are not to look to what men in themselves deserve, but to attend to the image of God, which exists in all, and to which we owe all honour and love. But in those who are of the household of faith, the same rule is to be more carefully observed, inasmuch as that image is renewed and restored in the by the Spirit of Christ. Therefore, whoever be the man that is presented to you as needing your assistance, you have no ground for declining to give it to him.”
John Calvin (1509-1564) in Institutes Book III 3.7.6.