“If we, then, are not our own (cf. 1 Cor 6:19) but the Lord’s, it is clear what error we must flee, and whither we must direct all the acts of our life. We are not our own: let not our reason nor our will, therefore, sway our plans and deeds. We are not our own: let us therefore not set it as our goal to seek what is expedient for us according to the flesh. We are not our own: in so far as we can, let us therefore forget ourselves and all that is ours.”
John Calvin (1509-1564) in Institutes of the Christian Religion, comments from 82. “The Christian Life”, chapter 7, “The Sum of the Christian Life: The Denial of Ourselves.”