to which he called you through our Gospel, for the obtaining of the glory of our Lord Jesus Christ.
Called by the gospel -- We are not called by some special silent revelation, or whispering in our ear. This "call" to salvation from God to us through the gospel, is only answered by our faith and obedience. The call is not profitable if we don’t obey the gospel, 2 Thessalonians 1:8, Romans 2:8.