8. When shall my longing be satisfied with good things? when, dost thou ask? “Thy youth shall be renewed as the eagle’s.” Dost thou then ask when thy soul is to be satisfied with good things? When thy youth shall be restored. And he addeth, as an eagle’s. Something here lieth hidden; what however is said of the eagle, we will not pass over silently, since it is not foreign to our purpose to understand it. Let this only be impressed upon our hearts, that it is not said without cause by the Holy Spirit. For it hath intimated unto us a sort of resurrection. And indeed the youth of the eagle is restored, but not into immortality, for a similitude hath been given, as far as it could be drawn from a thing mortal to signify a thing immortal, not to demonstrate it. The eagle is said, after it becometh overpowered with bodily age, to be incapable of taking food from the immoderate length of its beak, which is always increasing. For after the upper part of its beak, which forms a crook above the lower part, hath increased from old age to an immoderate length, the length of this increase will not allow of its opening its mouth, so as to form any interval between the lower beak and the crook above. For unless there be such an opening, it hath no power of biting like a forceps, by which to shear off what it may put within its jaws. The upper part therefore increasing, and being too far hooked over, it cannot open its mouth, and take any food. This old age doth to it, it is weighed down with the infirmity of age, and becometh too weak from want of power to eat; two causes of infirmity assaulting it, old age, and want. By a natural device, therefore, in order in some measure to restore its youth, the eagle is said to dash and strike against a rock the upper lip of its beak, by the too great increase of which the opening for eating is closed: and by thus rubbing it against the rock, it breaketh off the weight of its old beak, which impeded its taking food. It cometh to its food, and everything is restored: it will be after its old age like a young eagle; the vigour of all its limbs returneth, the lustre of its plumage, the guidance of its wings, it flieth aloft as before, a sort of resurrection taketh place in it. For this is the object of the similitude, like that of the Moon, which after waning and being apparently intercepted, again is renewed, and becometh full; and signifieth to us the resurrection; but when it is full it doth not remain so; again it waneth, that the signification may never cease. Thus also what hath here been said of the eagle: the eagle is not restored unto immortality, but we are unto eternal life; but the similitude is derived from hence, that the rock taketh away from us what hindereth us. Presume not therefore on thy strength: the firmness of the rock rubbeth off thy old age: for that Rock was Christ. In Christ our youth shall be restored like that of the eagle.…