“At first sight this seems contrary to what was said above: bear one another's burdens. For if each shall bear his own burden, then it is no longer possible to bear one another's burdens. But there we are commanded, as sinners, to bear with one another in this life and to help one another. Here he speaks of the Lord's judgment upon us. He will recognize us as sinners or saints, not according to another's sins, nor by comparison with those worse than ourselves, but according to our own work, the labor of our whole life. According to this work each will also receive recompense” (Blessed Jerome).
Speaking in this way, the Apostle sets each person's attention before the face of God's judgment. Occupy the mind with this, and you will forget to exalt yourself above others. You will also forget to sound a trumpet about yourself within yourself.
For God's judgment is not like human judgment. He may decide in a manner wholly contrary to our judgment and consciousness, for He sees us more deeply than we see ourselves. The decision of God's judgment is such that one should not expect it to be revised. It will set a seal upon your lot, which will remain unchanged unto ages of ages.
Therefore, since this decision is such, and since we cannot make a reliable favorable prejudgment about ourselves, it is better not to prejudge. Having this fear of an unfavorable decision for us at the judgment, let us strive more and more for deeds and for the disposition of heart. According to the true word of the Lord, condemnation is not foretold for such things. Let us forget what lies behind and stretch forward to what lies ahead (cf. Phil 3:13).
Memory of the judgment is the strongest means not only against self-conceit and exaltation, but also against every other passion and every passionate thought. All the holy ascetics taught this. In their lessons they placed the lesson on remembrance of the judgment first, together with remembrance of God as present everywhere and knowing all things.