Luke 13:24
Strive to enter in by the narrow gate; for many, I tell you, shall seek to enter in, and shall not be able.
Hebrews 4:11
Let us use diligence, therefore to enter into that rest [the heavenly rest], that no one may fall, after the same example of disobedience.
Hebrews 6:11-12
But we desire each of you to show the same diligence to the full assurance of hope to the end,
2 Peter 1:5
and for the same purpose also, giving all diligence add to your faith virtue, and to virtue knowledge,
2 Peter 1:10
Wherefore, brothers, use the greater diligence to make your calling and election sure; for doing these things you shall never fall.