* "Plausible tongue" refers to someone who is smooth-talking and persuasive, adept at using words to their advantage.
* "Fascinating expression" implies someone who is charismatic and captivating, easily drawing people in with their charm.
* "True virtue" signifies genuine goodness, integrity, and moral character.
The quote argues that people with charming appearances and persuasive communication skills are often not the ones who truly possess virtuous qualities. It implies that surface appeal can be deceptive, masking inner flaws or selfish motives.
In essence, the quote warns us to be cautious of appearances and not be swayed by someone's charm or ability to speak well. True virtue, it suggests, is often found in more subtle ways, through actions and genuine character rather than outward displays.