Matthew 11:12
And from the days of John the Baptist till now, the kingdom of heaven is entered by force, and they which strive with all their might take it by violence.
Luke 13:24
And he said to him, Strive to enter in thro' the strait gate; for many, I say to you, will seek to enter in, and shall not be able.
Luke 18:5-7
Yet because this widow giveth me trouble, I will do her justice, left by her continual coming she weary me out.
Philippians 2:12-13
Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but much more now in my absence, work out your own salvation with fear and trembling.
Colossians 1:29
For which also I labour, striving according to his mighty working, who worketh in me mightily.