Joy is a condition that is experienced, but it is more than a feeling; it is, primarily, a state of mind.
J. I. PackerWhat we often feel in ecstatic moments in this world - 'I don't ever want this to stop' - will be the constant thought of our hearts in that world. We shall think it, knowing that in fact it never WILL stop.
J. I. PackerYou thank God [for your salvation] because "you do not attribute your repenting and believing to your own wisdom, or prudence, or sound judgment, or good sense.
J. I. Packer