connatural

They may be such that in the ordinary course of nature, and so far as its forces and laws are concerned, they are never found to be absent from their connatural substances—inseparable accidents.

From Ontology or the Theory of Being by Peter Coffey

Another principle is man's habitual inclination to do good, by reason of which doing good becomes connatural to him: for which reason the liberal man takes pleasure in giving to others.

From Summa Theologica, Part I-II (Pars Prima Secundae) From the Complete American Edition by Saint Thomas Aquinas

Thus the human mind has no criterion of truth within itself, no elements of knowledge which are connatural and inborn.

From Christianity and Greek Philosophy or, the relation between spontaneous and reflective thought in Greece and the positive teaching of Christ and His Apostles by B. F. (Benjamin Franklin) Cocker

Wherefore this pleasure is very desirable as regards the sensitive appetite, both on account of the intensity of the pleasure, and because such like concupiscence is connatural to man.

From Summa Theologica, Part II-II (Secunda Secundae) Translated by Fathers of the English Dominican Province by Saint Thomas Aquinas

Now no act is perfectly produced by an active power, unless it be connatural to that power by reason of some form which is the principle of that action.

From Summa Theologica, Part II-II (Secunda Secundae) Translated by Fathers of the English Dominican Province by Saint Thomas Aquinas