One consistent paradox of the spiritual life, of the life pursuing growth in virtue, is the ever-present danger of becoming proud of your humility.
C.S. Lewis (and Saint Augustine before him) has rightly pointed out that humility is merely accepting the truth about ourselves. And about God.
But think about it: our humility ought to be proportionate to God’s greatness, which is infinite. Our humility can never be infinite.
Therefore, our humility always falls short and is nothing to take pride in.