Your comment shows how badly we understand what humility means and how much we run from the pain of the truth.

Humility is seeing ourselves through the eyes of God.

Seeing ourselves as we really are....our motives, our capabilities, our fears, our joys.

Sincerity means:  without wax (was used to be put on statues to hide defects in the marble or in the artist's work).

Simplicity means: without folds or plaits.   No complications.

Humility is both.