2 Corinthians 12:19

Again. Textual evidence favors (cf. p. 10) the reading “of old,” or “all the time,” that is, throughout the section in which Paul has been defending his ministry.

Excuse. Or, “justify,” “defend.” It is commonly used in the NT as a legal term for the defense made in court by the accused (see Luke 21:14; Acts 19:33; 24:10; 26:1; see on 4:10). Paul was now through “boasting” (2 Cor. 10:1 to 2 Cor. 12:13). An attempt to defend oneself is often interpreted as evidence of guilt and weakness. Paul anticipates that some of the Corinthians may form this erroneous impression. Do some of the Corinthians think that Paul’s objective is merely to win back their esteem and affection on a personal basis?

We speak before God. Paul’s defense was not simply to clarify differences that had arisen between them, but to discharge his responsibility toward God as an ambassador of Christ. He was dutybound to do everything within his power to win the Corinthians back from a wrong course (cf. 1 Cor. 2:15; 4:3). The Corinthians must take the right attitude toward Paul if they are to be free from the pseudo apostles who are leading them astray.

For your edifying. In making his defense Paul does not think of any advantage that will accrue to him, but only of their spiritual welfare. It is all for their sakes.