This is good advice, but paradoxically, outward arrogance can also be caused by thinking TOO LITTLE OF ONESELF, so another remedy can be developing confidence in oneself without needing to belittle others.
Be content with yourself. If you're the person with the most knowledge and technical expertise then great, but be humble about other skills that you may not have and that you can still learn from others: teaching, inspiring, helping, making people feel that they're being listened to without being condescending.