How do you know your misery?
From the law of God.
Scripture references
What does the law of God require of us?
Christ teaches us that briefly in Matthew 22:37-40: You shall love the Lord your God with all your heart, with all your soul, and with all your mind. This is the first and the great commandment; and the second is like it, You shall love your neighbour as yourself. On these two commandments hang all the law and the prophets.
Scripture references
Can you keep all these things perfectly?
No, I am by nature prone to hate God and my neighbour.