Galatians 1:15 & 16
"But when God, who set me apart from birth and called me by his grace, was pleased to reveal his Son in me so that I might preach him among the Gentiles, I did not consult any man," NIV translation
When Jesus showed up and changed Paul from a murderer to an evangelist, he did not go check with anyone to get permission. He understood that he had been set aside even before his birth for this purpose and he simply embraced what God would have him to do. That is the same for us as we all have been saved for a purpose and that purpose was set even before we were born. If we listen to God and not the words of men, He will tell us what He has designed for us to do. We can also be sure that it is better than anything we could come up with on our own.