# For the king ... to him ... from him

Paul is still speaking to King Agrippa, but he is referring to him in the third person. Alternate translation: "For you ... to you ... from you"

# I am persuaded

"I am sure"

# that none of this is hidden from him

"that he is aware of this" or "that you are aware of this" 

# has not been done in a corner

"has not happened in a dark place" or "in secret"