Psalm 122  To go "to the house of the Lord" was to David, something joyful.  All of Israel was required to go to Jerusalem for certain feasts. It was a long journey for many.  It may have been a dangerous or difficult trip.  But for David, it was a blessing.   He went to "give thanks to the name of the Lord" . He prayed for peace and prosperity.  He sought good for Jerusalem.  For here is where the house of the Lord was located.  The throne of David was there too.  But that is secondary to the house of the Lord, the dwelling place of the most High God. "Pray for the peace of Jerusalem" is often mentioned.  But the true worth of Jerusalem's peace is the presence of the House of the Lord.  Someday we will see that perfect peace in the New Jerusalem, with the throne of God and the Light of the Lamb. Oh, we will be glad to go then! Nothing will keep us away.
If we KNEW that Jesus was (physically) in our church building, wouldn't we go gladly?  No more dragging ourselves out of bed, making excuses why we can't go... I don't feel well, it's raining, there are only hypocrites there, etc.  We wouldn't care who or what else is there if we could sit with Jesus!  He is the One who died for us.  He is the One who makes us whole.  He is the Good Shepherd, the always Faithful God, the Prince of Peace, the Lord of lords.  We would run as fast as we could, wouldn't we?
He is there, in the midst of the believers. He is present when we worship Him together in spirit and in truth. He is there, but our eyes are blinded by our unbelief, by our excuses, by our lack of gladness in going to the house of the Lord.  Oh, forgive us, forgive me, Jesus.  May I be glad in Your Presence always.  Open my eyes Lord!  I want  to see Jesus!