'Vain' in the Bible

For Christ has not sent me to baptise, but to preach glad tidings; not in wisdom of word, that the cross of the Christ may not be made vain.

And again, The Lord knoweth the thoughts of the wise, that they are vain.

But I have used none of these things. Now I have not written these things that it should be thus in my case; for it were good for me rather to die than that any one should make vain my boast.

By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.

But by the grace of God I am what I am: and his grace which was bestowed upon me was not in vain; but I laboured more abundantly than they all: yet not I, but the grace of God which was with me.

And if Christ be not risen, then is our preaching vain, and your faith is also vain.

And if Christ be not raised, your faith is vain; ye are yet in your sins.

Therefore, my beloved brethren, be ye stedfast, unmoveable, always abounding in the work of the Lord, forasmuch as ye know that your labour is not in vain in the Lord.