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

Use not vain repetitions

For yourselves, brethren, know our entrance in unto you, that it was not in vain: / But even after that we had suffered before, and were shamefully entreated, as ye know, at Philippi, we were bold in our God to speak unto you the gospel of God with much contention.

I am afraid of you, lest I have bestowed upon you labour in vain.

Rejoice in the Lord always: and again I say, Rejoice.

Surely in vain the net is spread in the sight of any bird.