those who have far different ideas of a man, may yet agree in the notion of a father; which is a notion superinduced to the substance, or man, and refers only to an act of that think called man whereby he contributed to the generation of one of his own kind, let man be what it will.
 John Locke, An Essay Concerning Human Understanding (1689). copy citation

Context

“Relation different from the Things related. This further may be observed, That the ideas of relations may be the same in men who have far different ideas of the things that are related, or that are thus compared: v. g. those who have far different ideas of a man, may yet agree in the notion of a father; which is a notion superinduced to the substance, or man, and refers only to an act of that think called man whereby he contributed to the generation of one of his own kind, let man be what it will. 5. Change of Relation may be without any Change in the things related. The nature therefore of relation consists in the referring or comparing two things one to another; from which comparison one of both comes to be denominated.” source