'Exert' in the Bible

"Exert every effort to enter through the narrow door, because many, I tell you, will try to enter and will not be able to.

For sin will no longer be a master over you, since you are not under Law [as slaves], but under [unmerited] grace [as recipients of God’s favor and mercy].

To this end, like an earnest wrestler, I exert all my strength in reliance upon the power of Him who is mightily at work within me.

Exert all your strength in the honourable struggle for the faith; lay hold of the Life of the Ages, to which you were called, when you made your noble profession of faith before many witnesses.

Let us therefore make every effort to enter that rest [of God, to know and experience it for ourselves], so that no one will fall by following the same example of disobedience [as those who died in the wilderness].

And the beast was given a mouth (the power of speech), uttering great things and arrogant and blasphemous words, and he was given freedom and authority to act and to do as he pleased for forty-two months (three and a half years).