Q3. From where do you know your sin and misery?

Romans 3:20

“Therefore by the deeds of the law there shall no flesh be justified in his sight: for by the law is the knowledge of sin.”

Romans 7:7–25

“What shall we say then? Is the law sin? God forbid. Nay, I had not known sin, but by the law: for I had not known lust, except the law had said, Thou shalt not covet.”