Revelations

If who someone else isn't or what someone else can't do makes you feel better about who you are, you have already made something outside of God the foundation of your identity. God made you who you are solely out of His love for you, and not based on someone else's lack.  

Someone's walk with God is not necessarily for you to understand, but sometimes, God is trying to get you to understand something from someone's walk with God. When you are too busy outlining what their walk looks like versus what you believe it is supposed to look like, you miss out on the revelation that God is bringing you through that person.

When God has called us to do or be something, it isn't for ourselves: it is for the kingdom of God. Someone else's salvation and freedom may depends on your obedience and humility to God. Your obedience and fear of the Lord could be the breakthrough that someone else needs to see mountains moved in their lives because it could birth their new walk with God.