Our intentions may be very good, but, because the intelligence is limited, the action may turn out to be a mistake - a mistake, but not necessarily a sin, for sin comes out of a wrong intention.
The action carries a sense of incompleteness and frustration, but not of guilt. Victorious living does not mean perfect living in the sense of living without flaw, but it does mean adequate living, and that can be consistent with many mistakes.
Victorious living does not mean freedom from temptation, nor does it mean freedom from mistakes.
We are personalities in the making, limited, and grappling with things too high for us. Obviously we, at very best, will make many mistakes, but these mistakes need not be sins.