Luke 13:24
"Strive to go in by the small door. Many, I tell you, will seek to go in, but they will not be able,
Hebrews 4:11
Let us, therefore, make every effort to enter upon that Rest, so that none of us fall through such disbelief as that of which we have had an example.
Hebrews 6:11-12
But our great desire is that every one of you should be equally earnest to attain to a full conviction that our hope will be fulfilled, and that you should keep that hope to the end.
2 Peter 1:5
Yes, and for this very reason do your best to supplement your faith by goodness, goodness by knowledge,
2 Peter 1:10
Therefore, Brothers, do your best to put God's Call and Selection of you beyond all doubt; for, if you do this, you will never fall.