Power, Love and Self-Control blog. I didn't catch it myself until later. I decided to let it stand and do a little dictionary work.
As it turns out, "wary" has a GOOD side and a NEGATIVE one. It can mean watchful, careful, alert, vigilant, heedful--all of which are good. Whether in health habits, speech, actions or anything related to life and godliness, in this sense we should all be "wary". (See I Peter 5:8!)
However, it can also mean skeptical, openly distrustful, guarded, unwilling to confide, cagey. In THIS sense, we should NOT become "wary" in doing good. In fact, I think "wariness" might contribute to "weariness"! At any rate, it bears repeating: