This is Christian psychology at its best. Pastor Calvin dissecting the heart–
So blindly do we all rush in the direction of self-love, that every one thinks he has a good reason for exalting himself and despising all others in comparison. If God has bestowed on us something not to be repented of, trusting to it, we immediately become elated, and not only swell, but almost burst with pride. The vices with which we abound we both carefully conceal from others, and flatteringly represent to ourselves as minute and trivial, nay, sometimes hug them as virtues. When the same qualities which we admire in ourselves are seen in others, even though they should be superior, we, in order that we may not be forced to yield to them, maliciously lower and carp at them; in like manner, in the case of vices, not contented with severe and keen animadversion, we studiously exaggerate them. Hence the insolence with which each, as if exempted from the common lot, seeks to exalt himself above his neighbour, confidently and proudly despising others, or at least looking down upon them as his inferiors. The poor man yields to the rich, the plebeian to the noble, the servant to the master, the unlearned to the learned, and yet every one inwardly cherishes some idea of his own superiority. Thus each flattering himself, sets up a kind of kingdom in his breast; the arrogant, to satisfy themselves, pass censure on the minds and manners of other men, and when contention arises, the full venom is displayed. Many bear about with them some measure of mildness so long as all things go smoothly and lovingly with them, but how few are there who, when stung and irritated, preserve the same tenor of moderation? For this there is no other remedy than to pluck up by the roots those most noxious pests, self-love and love of victory (φιλονεικία καὶ φιλαυτία). This the doctrine of Scripture does. For it teaches us to remember, that the endowments which God has bestowed upon us are not our own, but His free gifts, and that those who plume themselves upon them betray their ingratitude. “Who maketh thee to differ,” saith Paul, “and what hast thou that thou didst not receive? now if thou didst receive it, why dost thou glory, as if thou hadst not received it?” (1 Cor. 4:7). Then by a diligent examination of our faults let us keep ourselves humble. Thus while nothing will remain to swell our pride, there will be much to subdue it. Again, we are enjoined, whenever we behold the gifts of God in others, so to reverence and respect the gifts, as also to honour those in whom they reside. God having been pleased to bestow honour upon them, it would ill become us to deprive them of it. Then we are told to overlook their faults, not, indeed, to encourage by flattering them, but not because of them to insult those whom we ought to regard with honour and good will. In this way, with regard to all with whom we have intercourse, our behaviour will be not only moderate and modest, but courteous and friendly. The only way by which you can ever attain to true meekness, is to have your heart imbued with a humble opinion of yourself and respect for others.
* Institutes III, vii, 4