Nothing is better for an ignorant man than silence, and if he were to consider it to be suitable, he would not be ignorant.

If thou possessest not the perfection of excellence
It is best to keep thy tongue within thy mouth.
Disgrace is brought on a man by his tongue.
A walnut, having no kernel, will be light.
A fool was trying to teach a donkey,
Spending all his time and efforts in the task.
A sage observed: ‘O ignorant man, what sayest thou?
Fear blame from the censorious in this vain attempt.
A brute cannot learn speech from thee.
Learn thou silence from a brute.’
Who does not reflect what he is to answer
Will mostly speak improperly.
Come. Either arrange thy words like a wise man
Or remain sitting silent like a brute.