Do nothing secretly; for Time sees and hears all things, and discloses all.

Secrecy has a short shelf life. What you do quietly tends to surface later, through a stray remark, a record you forgot about, or simply the slow way things get said. Most of what people hide is not hidden well; it is only unmentioned for a while.

A useful test before acting is whether you would be comfortable having it described plainly by someone who was there. If the answer is no, the trouble is usually the act rather than the risk of discovery. Where the quiet is genuine discretion, it survives that test easily.