People reveal how they understand power by how they treat those unable to retaliate.

How someone treats a person who cannot retaliate is the whole answer. Waiting staff, junior colleagues, anyone dependent, anyone with no route to complain. The behaviour there is unconstrained by consequence, which makes it the only unfiltered sample of what a person believes power is for.

Use this when assessing someone you are considering trusting. And use it on yourself, honestly, by thinking about your last few interactions with people who could not have pushed back.