The Chariot is seven, contradiction held down by will; Strength is eight, and doesn't hold down — it tames. A woman closes a lion's jaws with her bare hands, the same infinity sign above her head as the Magician. Compare the Chariot: its beasts are outside, pulling, and the method is control; Strength's beast is your own instinct, and the method is relationship — she carries no weapon and the lion isn't fighting. Eight in the minors is repetition and momentum; in the majors that momentum is drawn back into the body and becomes inner steadiness.
Where you'll recognise it: wanting to lash out and not doing it, handling a difficult person or situation with patience rather than hardness, the moments of 'I can, because I don't need to prove it'. This card is about living with your own wildness, not eliminating it.
Running well, Strength is the most composed state there is: powerful without display, able to wait, able to say no gently. Stuck, its problem is the two extremes — eaten by the lion (impulse in charge) or the lion locked away (over-suppressed). The infinity sign means this isn't done once. Taming the lion is daily work.