One’s opinion of oneself has no positive effect upon eternal destiny. It matters not what I think of myself. Such opinions tend toward self-approval. Approval of one’s own actions does not mean that the Lord approves of them. He does not rubber-stamp our own judgments of self.
For it is not the person who commends himself who is approved, but the person the Lord commends” 2 Cor 10.18.
To commend oneself is to declare one’s intentions, motivations, attitudes, and actions as good. Such an attempt is vain because man is not an accurate judge of what is good. But God tells man what is good, Mic 6.8. His revealed will is good, Rom 12.2. So we must “examine all things” as we receive his revelation and “hold fast to what is good” 1 Thes 5.21.
In the Bible we discover what God considers good. Scripture informs us fully what the Lord commends. In a word, God is good and does only good, Psa 119.68. So he is the measure and standard.What he judges as good is what he commends. The person who does what he commends is approved by him.
To be approved by God is to hear him say, “Well done, good and faithful slave. … Enter into the joy of your master” Mt 25.21, 23. Such approval, therefore, involves eternal reward.
If we do not know what the Lord commends through the study of Scripture, and if we do not practice and teach it, we will be ashamed on the last day, 2 Tim 2.15.