'Endeavor' in the Bible

So I sent messengers to them, replying "I am involved in a great endeavor, so I can't leave. Why should the work stop while I leave it to come down to you?"

So I decided to discern the benefit of wisdom and knowledge over foolish behavior and ideas; however, I concluded that even this endeavor is like trying to chase the wind!

even from among your own selves men will arise, speaking perverse and distorted things, to draw away the disciples after themselves [as their followers].

never lagging behind in diligence; aglow in the Spirit, enthusiastically serving the Lord;

Then let us not criticize one another anymore, but rather determine this—not to put an obstacle or a stumbling block or a source of temptation in another believer’s way.

But if, while we seek to be justified in Christ [by faith], we ourselves are found to be sinners, does that make Christ an advocate or promoter of our sin? Certainly not!

and to make it your ambition to live quietly and peacefully, and to mind your own affairs and work with your hands, just as we directed you,

Moreover, I will diligently endeavor [to see to it] that even after my departure you will be able, at all times, to call these things to mind.

Some, when they argue with you, you must endeavor to convince;