William Burkitt on 2 Timothy 4:21

Our apostle being greatly desirous to see Timothy before his death, reneweth his request and suit to him to make haste and come before winter: the personal presence of good men is much, very much desired by them, in order to excite and quicken each other.

To encourage Timothy to hasten to him, he names several persons of note that were then at Rome, who sent salutations to him, and would rejoice to see him.

But where were all these, when our apostle was upon his trial?

Ans. They all forsook him, and not one of them stood with him.

Behold what frailty there may be! and what fear will do, in persons of choice note for eminency and grace in the church of God!