Luke 13:24
Strive to enter in through the narrow door; for many, I say to you, will seek to enter in, and will not be able.
Hebrews 4:11
Let us then strive to enter into that rest, that no one may fall, as a like example of disobedience.
Hebrews 6:11-12
But we earnestly desire that every one of you may show the same diligence with regard to the full assurance of your hope even to the end;
2 Peter 1:5
even for this very reason, giving all diligence, add to your faith virtue, and to virtue knowledge,
2 Peter 1:10
Wherefore the rather, brethren, give diligence to make your calling and election sure; for if ye do these things, ye will never fall.