Luke 13:24
strive to enter in at the narrow gate: for I declare unto you, that many shall try to get in, and shall not be able.
Hebrews 4:11
Let us labour therefore to enter into that rest, lest any of us by imitating their incredulity, should fall short thereof like them.
Hebrews 6:11-12
but we desire that every one of you may shew the same concern, continuing to discharge the condition upon which your hopes are founded: that ye be not unactive,
2 Peter 1:5
Do you on your part employ all your care in adding to your faith, fortitude: to fortitude, knowledge:
2 Peter 1:10
Wherefore be the more diligent, my brethren, to secure your vocation and election by your virtuous actions, for by so doing, you will never relapse: