The gratitude of God
Being unaware of God's grateful nature has certainly worked to make me seek to please men instead. The other thing I noticed while I was reading is that this attentiveness to man is the essence of hypocrisy. Since man looks on the outward appearance and not on the heart, when man and not God is the audience, we will make the outside clean instead of the inside. It's not a matter of personal virtue. It's the nature of the audience we want to please.