Does someone take a quick bath? Don't say they're doing it wrong — just say they're doing it quickly. Does someone drink a lot of wine? Don't say they're doing something bad — just say they drink a lot. You can't know if someone is acting badly unless you completely understand why they're doing it. This way, you won't jump to conclusions about things you don't fully understand.
Does anyone bathe hastily? Do not say that he does it ill, but hastily. Does anyone drink much wine? Do not say that he does ill, but that he drinks a great deal. For unless you perfectly understand his motives, how should you know if he acts ill? Thus you will not risk yielding to any appearances but such as you fully comprehend.