Luke 13:24
"Strive to enter through the narrow door, for many, I tell you, will seek to enter and will not be able.
Hebrews 4:11
Therefore let us be diligent to enter that rest, so that no one will fall by following the same example of disobedience.
Hebrews 6:11-12
And we desire each one of you to show the same diligence in realizing the full assurance of hope until the end,
2 Peter 1:5
For this very reason, make every effort to add to your faith virtue; and to virtue, knowledge,
2 Peter 1:10
Therefore, brethren, be all the more eager to make your calling and election sure. For if you do these things, you will never fall;