Psalm 73 is a most interesting mix between closeness to God and complete inward desolation in which one feels not only poor and troubled, but left behind by God. It is typical of many of the psalms which go in and out between complaint and praise.
The sanctuary of God is the key and transition between darkness and light in this psalm. We are often so acclimated to darkness that we actually somehow find some sort of comfort and relief apart from God. It usually and perhaps always for us will be in things which are not necessarily bad in and of themselves. But the sanctuary of God is different. Into that place we take nothing except ourselves in all our brokenness and nakedness before God. We have essentially tuned out other things, and are tuned in to one thing only: the things of God, and more than that, God himself.
Again, other things might have their place, but if we have been in a season akin to “the dark night of the soul,” in which all is difficult, including the sense we can make out of life, all might seem empty, then perhaps that is preparation for entering into God’s sanctuary where we might find the peace and rest, even the very presence of God.
We need that sanctuary, I’m sure again and again, but it’s a reminder that God’s presence actually fills all things, even the very thing which troubles us and threatens to bring us down. But we can only come to realize that through entering the sanctuary, God’s holy place, and remaining there for a time, in and through Jesus.