TSK · Luke 9:62

Then they will not be like their ancestors, who were a stubborn and rebellious generation, a generation that was not committed and faithful to God.

Barnabas wanted to bring John called Mark along with them too,

For Demas deserted me, since he loved the present age, and he went to Thessalonica. Crescens went to Galatia and Titus to Dalmatia.

But he must ask in faith without doubting, for the one who doubts is like a wave of the sea, blown and tossed around by the wind.