Luke 9:62
and Jesus said unto him, 'No one having put his hand on a plough, and looking back, is fit for the reign of God.'
Psalm 78:8-9
And they are not like their fathers, A generation apostate and rebellious, A generation! it hath not prepared its heart, Nor stedfast with God is its spirit.
Acts 15:37-38
And Barnabas counselled to take with them John called Mark,
Philippians 3:13
brethren, I do not reckon myself to have laid hold; and one thing -- the things behind indeed forgetting, and to the things before stretching forth --
Hebrews 10:38
and 'the righteous by faith shall live,' and 'if he may draw back, My soul hath no pleasure in him,'
Luke 17:31-32
in that day, he who shall be on the house top, and his vessels in the house, let him not come down to take them away; and he in the field, in like manner, let him not turn backward;
2 Timothy 4:10
for Demas forsook me, having loved the present age, and went on to Thessalonica, Crescens to Galatia, Titus to Dalmatia,
James 1:6-8
and let him ask in faith, nothing doubting, for he who is doubting hath been like a wave of the sea, driven by wind and tossed,
2 Peter 2:20-22
for, if having escaped from the pollutions of the world, in the acknowledging of the Lord and Saviour Jesus Christ, and by these again being entangled, they have been overcome, become to them hath the last things worse than the first,