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This PARALLEL SYMMETRY is about those who have deceived themselves into thinking they are great.
1) The INTRODUCTORY SUMMARY counsels us to restore the one caught in trespass with gentleness.
2) The FIRST/FIRST elements, A and A′, look at the temptation of boasting about our own thoughts and accomplishments while ignoring our own issues. We can all fall into that trap.
3) Based on the LAST/LAST rule, the emphasis in verses 3 and 6 compares self-deception with equality. That is, if you have been teaching, listen to another who has also been taught.
4) The two IMPERATIVE verbs in verse 2 are commands of compassion with the situation of others.