Reply Obj. 2: A man ought to bear bodily injury for his friend's sake, and precisely in so doing he loves himself more as regards his spiritual mind, because it pertains to the perfection of virtue, which is a good of the mind. In spiritual matters, however, man ought not to suffer injury by sinning, in order to free his neighbor from sin, as stated above.
Reply Obj. 3: As Augustine says in his Rule (Ep. ccxi), the saying, "'charity seeks not her own,' means that it prefers the common to the private good." Now the common good is always more lovable to the individual than his private good, even as the good of the whole is more lovable to the part, than the latter's own partial good, as stated above (A. 3). _______________________
FIFTH ARTICLE [II-II, Q. 26, Art. 5]
Whether a Man Ought to Love His Neighbor More Than His Own Body?
Objection 1: It would seem that a man is not bound to love his neighbor more than his own body. For his neighbor includes his neighbor's body. If therefore a man ought to love his neighbor more than his own body, it follows that he ought to love his neighbor's body more than his own.
Obj. 2: Further, a man ought to love his own soul more than his neighbor's, as stated above (A. 4). Now a man's own body is nearer to his soul than his neighbor. Therefore we ought to love our body more than our neighbor.
Obj. 3: Further, a man imperils that which he loves less for the sake of what he loves more. Now every man is not bound to imperil his own body for his neighbor's safety: this belongs to the perfect, according to John 15:13: "Greater love than this no man hath, that a man lay down his life for his friends." Therefore a man is not bound, out of charity, to love his neighbor more than his own body.
On the contrary, Augustine says (De Doctr. Christ. i, 27) that "we ought to love our neighbor more than our own body."
I answer that, Out of charity we ought to love more that which has more fully the reason for being loved out of charity, as stated above (A. 2; Q. 25, A. 12). Now fellowship in the full participation of happiness which is the reason for loving one's neighbor, is a greater reason for loving, than the participation of happiness by way of overflow, which is the reason for loving one's own body. Therefore, as regards the welfare of the soul we ought to love our neighbor more than our own body.
Reply Obj. 1: According to the Philosopher (Ethic. ix, 8) a thing seems to be that which is predominant in it: so that when we say that we ought to love our neighbor more than our own body, this refers to his soul, which is his predominant part.