You told me with a boasting but uncertain swagger that some go up and others go down... And others, like yourself!, are just idling.

Your indolence saddened me, and I added: idlers are made to shift by those going up; and — normally with greater vigour — also by those going down. Consider what an uncomfortable attitude you are adopting!

The holy bishop of Hippo already pointed it out: not to go forward is to go back.