But neither Titus, who was with me, being a Greek, was compelled to be circumcised: But neither Titus, who was with me - The apostle proceeds to state that his account was so satisfactory to the apostles, that they not only did not require him to insist on the necessity of circumcision among the Gentiles, but did not even require him to have Titus, who was a Greek, circumcised; though that might have appeared expedient, especially at Jerusalem, to have prevented false brethren from making a handle of his uncircumcision, and turning it to the prejudice of the Gospel in Judea.
To spy out our liberty - The Judaizing brethren got introduced into the assembly of the apostles, in order to find out what was implied in the liberty of the Gospel, that they might know the better how to oppose St. Paul and his fellows in their preaching Christ to the Gentiles, and admitting them into the Church without obliging them to observe circumcision and keep the law. The apostle saw that while such men were in the assembly it was better not to mention his mission among the Gentiles, lest, by means of those false brethren, occasion should be given to altercations and disputes; therefore he took the opportunity, by private conferences, to set the whole matter, relative to his work among the Gentiles, before the chief of the apostles.