When you start to **** people off with your "virtues" they are officially vices :o)
When the virtue becomes too obsessive, when the vice means attention to meaningful details.
Not sure, but I suspect that when it is time to "move on" and expand your horizons, but you refrain from following your inner voice that is prompting you to do so, you begin to devise a way to force yourself to take that next step. That's when your greatest strength starts becoming your prison. Prisons are painful places, and eventually, the call to release them will be so great that we will begin to look for freedom. Then the vice is gone and what was a virtue is only part of an even better life.<br />
In a super-condensed nutshell: Beliefs make it so.
Gaining true knowledge and practice it is virtue.<br />
Acting against our knowledge is vice.<br />
Knowledge tells us that truthfulness is good;<br />
we practice it, we are virtuous.<br />
We tell lies we are vicious.<br />
We know our knowledge, intention and action,<br />
therefore we are truly our own judge.
Context and situation is important, for example what is a virtue in a war zone often is a vice in civilian life.