# Though I am in the right

"Although I have done right things" or "Even though I am innocent"

# my own mouth would condemn me

"my own words would accuse me" or "what I say would condemn me"

# blameless

"faultless"

# my words would prove me to be guilty

"God would use what I say to prove me guilty"

# guilty

"twisted" or "crooked."