Gregory the Great
Catena Aurea · Lukasevangelium 21
And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh. And he spake to them a parable; Behold the fig tree, and all the trees; When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand. So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand. Verily I say unto you, This generation shall not pass away, till all be fulfilled. Heaven and earth shall pass away: but my words shall not pass away.
(Hom. 1. in Ev.) Having in what has gone before spoken against the reprobate, He now turns His words to the consolation of the elect; for it is added, When these things begin to be, look up, and lift up your heads, for your redemption draweth nigh; as if he says, When the buffettings of the world multiply, lift up your heads, that is, rejoice your hearts, for when the world closes whose friends ye are not, the redemption is near which ye seek. For in holy Scripture the head is often put for the mind, for as the members are ruled by the head, so are the thoughts regulated by the mind. To lift up our heads then, is to raise up our minds to the joys of the heavenly country.