Luke 9:62
Jesus answered him, "No one who has put his hand to the plough, and then looks behind him, is fit for the Kingdom of God.
Acts 15:37-38
Barnabas, however, was bent on taking with them John, whose other name was Mark,
Philippians 3:13
Brethren, I do not imagine that I have yet laid hold of it. But this one thing I do--forgetting everything which is past and stretching forward to what lies in front of me,
Hebrews 10:38
But it is by faith that My righteous servant shall live; and if he shrinks back, My soul takes no pleasure in him."
Luke 17:31-32
"On that day, if a man is on the roof and his property indoors, let him not go down to fetch it; and, in the same way, he who is in the field, let him not turn back.
2 Timothy 4:10
For Demas has deserted me--loving, as he does, the present age--and has gone to Thessalonica; Crescens has gone to Galatia, and Titus to Dalmatia.
James 1:6-8
But let him ask in faith and have no doubts; for he who has doubts is like the surge of the sea, driven by the wind and tossed into spray.
2 Peter 2:20-22
For if, after escaping from the pollutions of the world through a full knowledge of our Lord and Saviour Jesus Christ, people are once more entangled in these pollutions and are overcome, their last state has become worse than their first.