The love we bear to our wives is very lawful, and yet theology thinks fit to curb and restrain it. As I remember, I have read in one place of St. Thomas Aquinas,--[Secunda Secundx, Quaest. 154, art. 9.]--where he condemns marriages within any of the forbidden degrees, for this reason, amongst others, that there is some danger, lest the friendship a man bears to such a woman, should be immoderate; for if the conjugal affection be full and perfect betwixt them, as it ought to be, and that it be over and above surcharged with that of kindred too, there is no doubt, but such an addition will carry the husband beyond the bounds of reason.