Q3: How do you come to know your misery?
A3: The law of God tells me.
Q4: What does God's law require of us?
A4: Christ teaches us this in summary in Matthew 22--"Love the Lord your God with all your heart and with all your soul and with all your mind and with all your strength. This is the first and greatest commandment. And the second is like it: Love your neighbor as yourself. All the Law and the Prophets hang on these two commandments."
Q5: Can you live up to all this perfectly?
A5: No. I have a natural tendency to hate God and my neighbor.
The Gospel --> I am a sinner who cannot please God.