'Gain' 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.

For though I am free from all men, I have made myself a slave to everyone, so that I may win more [for Christ].

If I give all my possessions to feed the poor, and if I surrender my body to be burned, but do not have love, it does me no good at all.

What good has it done me if, [merely] from a human point of view, I fought with wild animals at Ephesus? If the dead are not raised [at all], let us eat and drink [enjoying ourselves now], for tomorrow we die.