Luke 13:24
But He said unto them, Strive to enter in at the strait gate; for I tell you, many will desire to enter in, and shall not be able.
Hebrews 4:11
Let us labour therefore to enter into that rest, least any one fall after the same example of unbelief.
Hebrews 6:11-12
And we desire that every one of you would shew the same diligence to acquire the full assurance of hope even unto the end:
2 Peter 1:5
And to this giving all diligence, add to your faith fortitude;
2 Peter 1:10
Wherefore, my brethren, be the more diligent thus to make your calling and election sure; for if ye do these things ye shall never fall.