Luke 9:62
But Jesus said to him, No one having laid his hand on the plough and looking back is fit for the kingdom of God.
Psalm 78:8-9
And might not be as their fathers, a stubborn and rebellious generation, a generation that prepared not their heart, and whose spirit was not stedfast with God.
Acts 15:37-38
And Barnabas proposed to take with them John also, called Mark;
Philippians 3:13
Brethren, I do not count to have got possession myself; but one thing forgetting the things behind, and stretching out to the things before,
Hebrews 10:38
But the just shall live by faith; and, if he draw back, my soul does not take pleasure in him.
Luke 17:31-32
In that day, he who shall be on the housetop, and his stuff in the house, let him not go down to take it away; and he that is in the field, let him likewise not return back.
2 Timothy 4:10
for Demas has forsaken me, having loved the present age, and is gone to Thessalonica; Crescens to Galatia, Titus to Dalmatia.
James 1:6-8
but let him ask in faith, nothing doubting. For he that doubts is like a wave of the sea driven by the wind and tossed about;
2 Peter 2:20-22
For if after having escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, again entangled, they are subdued by these, their last state is worse than the first.