Rejoicing

"Rejoicing in the Bible is much deeper than simply being happy about something. Paul directed that we should 'rejoice in the Lord always' (Phil. 4:4), but this cannot mean 'always feel happy,' since no once can command someone to always have a particular emotion. To rejoice is to treasure a thing, to assess its value to you, to reflect on its beauty and importance until your heart rests in it and tastes the sweetness of it. 'Rejoicing' is another way of praising God until the heart is sweetened and rested."

Tim Keller, Counterfeit Gods