'Opportunity' in the Bible

Were you a slave when you were called? Do not worry about that [since your status as a believer is equal to that of a freeborn believer]; but if you are able to gain your freedom, do that.

because a wide door for effective service has opened to me [in Ephesus, a very promising opportunity], and there are many adversaries.

As for our brother Apollos, I have strongly encouraged him to visit you with the other brothers. It was not at all his desire to come now, but he will come when he has the opportunity.