Those who live in my house receive the benefit of my presence and protection. Though I might be concerned for the well-being of others, my presence when called on is not a given. God amplifies this point when He says in Psalms 91:1, "He who dwells in the shelter of the Most High will abide in the shadow of the Almighty."
To be in the "shadow" of someone necessitates proximity. Still, the promise of His closeness/presence is not without condition. Those to whom it is guaranteed are the residents of His house. He doesn't give the keys to just anyone.
Psalm 15 says God's housemates must practice eleven things (all of which are acts of worship to God and the practice of "best conduct" toward man) before He assigns them a bedroom. If we abide in God's dwelling, He will be near enough to shield us from harm.
So, if you want the long shadow of God's presence and protection from those who spiritually tries to take what has been promised, start living right and living well...