Question

But speak all good you can devise of Caesar and say you do it by our permission .
1. What is the speker afraid of?
2. What opinion do you form of speaker?

Answer 1

1) speaker is afraid because he know that and Antony is a friend of Caesar and he will will say something wrong which can be dangerous for them

Answer 2

1) the speaker is afraid of the good
speaking talent of Antony.
2) the speaker is Brutus he is afraid of the fact that mark Antony may change the minds of the crowd .