Now, since I have declared who is our neighbor, let us see also in what sort this neighbor of ours ought to be loved. Our neighbor must be loved simply, without any colored deceit, with the very self-same love wherewith we love ourselves or that wherewith Christ hath loved us. For, in all things, we must stand our neighbor in stead and do him pleasure, so far as the law of humanity shall be found to require.
From: The Decades of Henry Bullinger, edited by Thomas Harding; 2 volumes; reprint (Grand Rapids: Reformation Heritage Books, 2004), 1:186. The quotation is from the 10th sermon of the 1st Decade.
Henry [Heinrich] Bullinger (1504-1575), was a Swiss pastor and theologian. Five years older than John Calvin, he was, with Calvin, a member of the second generation of Protestant Reformers.