'Avail' 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.

Notice, it is I, Paul, who tells you that if you receive circumcision [as a supposed requirement of salvation], Christ will be of no benefit to you [for you will lack the faith in Christ that is necessary for salvation].

for I know [with confidence] that this will turn out for my deliverance and spiritual well-being, through your prayers and the [superabundant] supply of the Spirit of Jesus Christ [which upholds me].

whereas Christ, having offered the one sacrifice [the all-sufficient sacrifice of Himself] for sins for all time, sat down [signifying the completion of atonement for sin] at the right hand of God [the position of honor],