If you can be well without health, you can be happy without virtue.

The comparison does all the work: one impossibility is used to show up another. Just as there is no version of being well that skips having a working body, there is no contented life assembled on top of conduct you cannot look at. You can be comfortable, entertained, even successful. What you cannot be is settled, because something always needs managing.

If a part of your life will not bear examination, notice how much energy goes into not examining it. That energy is a tax you are already paying. Fixing the underlying thing is usually cheaper than maintaining the arrangement around it.