Even those I will bring to My holy mountain and make them joyful in My house of prayer. Their burnt offerings and their sacrifices will be acceptable on My altar. For My house will be called a house of prayer for all people.
Have you ever thought why He will make us joyful in His house of prayer? I think we are happiest when we have no burdens. God wants us to take those burdens and lay them at His feet. What better way to lay them down than at the altar. I believe His house is a place of healing and restoration. God wants us to come to His house, spend time with Him during praise and Worship, listen to His Word and lay down any burdens that we have so that we can live a fulfilled life. If you want to chose to be joyful, then give those burdens to God for Him to carry and let Him lift that boulder off your shoulder so that you can be joyful!