John 3:19-20
Fly we then vainglory, for this is a passion more tyrannical than any. Hence spring covetousness and love of wealth, hence hatred and wars and strifes; for he that desires more than he has, will never be able to stop, and he desires from no other cause, but only from his love of vainglory. For tell me, why do so many encircle themselves with multitudes of eunuchs, and herds of slaves, and much show? Not because they need it, but that they may make those who meet them witnesses of this unseasonable display.
If then we cut this off, we shall slay together with the head the other members also of wickedness, and there will be nothing to hinder us from dwelling on earth as though it were heaven. Nor does this vice merely thrust its captives into wickedness, but is even co-existent with their virtues, and when it is unable entirely to cast us out of these, it still causes us much damage in the very exercise of them, forcing us to undergo the toil, and depriving us of the fruit. For he that with an eye to this, fasts, and prays, and shows mercy, has his reward.
What can be more pitiable than a loss like this, that it should befall man to bewail himself uselessly and in vain, and to become an object of ridicule, and to lose the glory from above? Since he that aims at both cannot obtain both. It is indeed possible to obtain both, when we desire not both, but one only, that from heaven; but he cannot obtain both, who longs for both. Wherefore if we wish to attain to glory, let us flee from human glory, and desire that only which comes from God; so shall we obtain both the one and the other; which may we all enjoy, through the grace and loving kindness of our Lord Jesus Christ, by whom and with whom, to the Father and the Holy Ghost, be glory for ever and ever. Amen.
Source: Homilies on the Gospel of John (New Advent)