Main point summary
When Paul went to Jerusalem to explain his gospel to the pillars to preserve his ministry, they didn't add to his gospel but rather gave their blessing to Paul's ministry to the Gentiles.
2:1-10 (Feb. 22/19)
Then after fourteen years I went up again to Jerusalem with Barnabas,
taking Titus along with me.
I went up
because of a revelation
and set before them ... the gospel that I proclaim among the Gentiles
(though privately before those l who seemed influential)...,
n in order to make sure I was not running
or had not o run in vain.
But even Titus, who was with me, p was not forced to be circumcised,
though he was a Greek.
q Yet because of false brothers secretly brought in—
who r slipped in
to spy out s our freedom that we have in Christ Jesus,
t so that they might bring us into slavery—
to them we did not yield in submission even for a moment,
so that u the truth of the gospel might be preserved for you.
And from those v who seemed to be influential
(what they were makes no difference to me;
w God shows no partiality)—
those, I say, who seemed influential x added nothing to me.
On the contrary, when they saw that I had been y entrusted with z the gospel to the uncircumcised,
just as Peter had been entrusted with the gospel to the circumcised
(for he who worked through Peter for his apostolic ministry to the circumcised
worked also through me for mine to the Gentiles),
and when James and Cephas and John, v who seemed to be a pillars, perceived the b grace that was given to me,
they c gave the right hand of fellowship to Barnabas and me,
that we should go to the Gentiles
and they to the circumcised.
Only, they asked us to remember the poor,
d the very thing I was eager to do.
Paul went to Jerusalem, according to God's will, to explain his gospel to the Gentiles to the pillars so that his ministry would not be in vain.
Titus wasn't forced to be circumcised, because even though some false brothers tried to enslave believers, he wanted to preserve the gospel for the Galatians.
Instead, rather than adding anything to his gospel, when the pillars perceived God's will and grace on Paul, they gave their blessing to Paul's ministry to the Gentiles.