I say the truth in Christ, I lie not, my conscience also bearing me witness in the Holy Ghost, I say the truth in Christ, I lie not - This is one of the most solemn oaths any man can possibly take. He appeals to Christ as the searcher of hearts that he tells the truth; asserts that his conscience was free from all guile in this matter, and that the Holy Ghost bore him testimony that what he said was true. Hence we find that the testimony of a man's own conscience, and the testimony of the Holy Ghost, are two distinct things, and that the apostle had both at the same time.
As the apostle had still remaining a very awful part of his commission to execute, namely, to declare to the Jews not only that God had chosen the Gentiles, but had rejected them because they had rejected Christ and his Gospel, it was necessary that he should assure them that however he had been persecuted by them because he had embraced the Gospel, yet it was so far from being a gratification to him that they had now fallen under the displeasure of God, that it was a subject of continual distress to his mind, and that it produced in him great heaviness and continual sorrow.