counsel of perfection

noun3

1. •
   Advice as to a means of striving for moral perfection.
2. •
   Noble but impractical idealistic advice.

   • To a practical statesman that will seem perhaps a counsel of perfection; and, certainly, it is a counsel that, at every stage, will encounter acute difficulties of practical operation. — 1919
3. •
   Any of the virtues of obedience, chastity, and charity, or other ascetic practices, especially in monastic vows.