Firmness is strength, sturdiness, decisiveness, power, energy, keenness. Those who use firmness well cannot be corrupted by wealth and rank, cannot be moved by poverty and lowliness, cannot be suppressed by aggression.
This passage provides Liu I-ming’s canonical positive definition of firmness as the irreducible yang energy that renders the practitioner incorruptible by external circumstance.
, The Taoist I Ching, 1986thesis