Jesus is at the right hand of the Father, right now. That means, amongst other things, that Jesus is enjoying perfect happiness and joy with his Father, just as he always has and always will. Psalm 16, which we heard preached on Sunday evening, puts it in unashamedly succulent terms:
'…in your presence there is fullness of joy; at your right hand are pleasures forevermore.' (verse 11)
And the psalm was written for Jesus to sing.
As writer John Piper puts it in his excellent little book Seeing and Savouring Jesus Christ (available for free online!):
'If Christ is gloomy, or even calmly stoical, eternity will be a long, long sigh… It is not glorious to be gloomy. Therefore Christ has never been gloomy. From eternity he has been the mirror of God’s infinite mirth… But if it is not glorious to be gloomy, neither is it glorious to be glib. The carefree merriment of a ballroom gala and the irrepressible joy in a Russian gulag are not the same. One is trite, the other triumphant. One is glib, the other glorious. There is a pasted smile that has never known pain. And it does not make for a great pastor or a great Saviour. But Christ is a great Saviour.'
And all he has, Christians have in him—so we confess to the Lord, 'You are my Lord, I have no good apart from you' (verse 2).