Luke 13:24
And he said to him, Strive to enter in thro' the strait gate; for many, I say to you, will seek to enter in, and shall not be able.
Hebrews 4:11
Let us labour, therefore, to enter into that rest, lest any one should fall, after the same example of unbelief.
Hebrews 6:11-12
But we desire that every one of you would shew unto the end the same diligence, to the full assurance of hope,
2 Peter 1:5
For this very reason giving all diligence, add to your faith courage,
2 Peter 1:10
Wherefore the rather, brethren, be diligent to make your calling and election firm; for if ye do these things, ye shall never fall.