Emphases in bold are mine.
Our thoughts in this present life should turn on the praise of God, because it is in praising God that we shall rejoice for ever in the life to come; and no one can be ready for the next life unless he trains himself for it now. So we praise God during our earthly life, and at the same time we make our petitions to him. Our praise is expressed with joy, our petitions with yearning. We have been promised something we do not yet possess, and because the promise was made by one who keeps his word, we trust him and are glad; but insofar as possession is delayed, we can only long and yearn for it. It is good for us to persevere in longing until we receive what was promised, and yearning is over; then praise alone will remain.