'Strive' in the Bible

Not that I have already attained this -- that is, I have not already been perfected -- but I strive to lay hold of that for which Christ Jesus also laid hold of me.

with this goal in mind, I strive toward the prize of the upward call of God in Christ Jesus.

Therefore, dear friends, since you are waiting for these things, strive to be found at peace, without spot or blemish, when you come into his presence.