This quote by Plautus is a tip that it is frequently better to stick to what we understand, even if it is not perfect. It recommends that it is much better to stay with the evil we understand, rather than run the risk of the unidentified. This is since the unidentified could be even worse than the evil we currently know. It is a warning to be cautious and to think twice before making a change.
The quote also suggests that it is much better to accept the evil we know, instead of to fight it. This is because fighting it might result in more harm than great. It is a reminder that often it is better to accept the situation and make the best of it, instead of to attempt and alter it.
In general, this quote by Plautus is a suggestion to be cautious and to reconsider before making a modification. It recommends that it is frequently much better to accept the evil we understand, instead of to risk the unidentified. It is a reminder to reconcile the circumstance, rather than to fight it.
"Don't lower your expectations to meet your performance. Raise your level of performance to meet your expectations. Expect the best of yourself, and then do what is necessary to make it a reality"
"The man who makes everything that leads to happiness depends upon himself, and not upon other men, has adopted the very best plan for living happily. This is the man of moderation, the man of manly character and of wisdom"