The strongest commitment survives occasional imperfect days without becoming an imperfect life.

There is a large gap between a few imperfect days and an imperfect life, and the gap is closed only by interpretation. Strong commitments hold that line. They let a bad day be a bad day rather than evidence of a general failing, which is what allows them to survive the many bad days a long project contains.

Watch the size of the conclusions you draw from a single lapse. If a missed session has you assessing your character, the conclusion is too big for the evidence. Shrink it back down to the day it belongs to.