That None Might Be Excluded

Since the perfection of blessedness consists in the knowledge of God, he has been pleased, in order that none might be excluded from the means of obtaining felicity, not only to deposit in our minds that seed of religion of which we have already spoken, but so to manifest his perfections in the whole structure of the universe, and daily place himself in our view, that we cannot open our eyes without being compelled to behold him. (John Calvin, Institutes, Book 1, Chapter V)

Unless They Place Their Entire Happiness in Him

For, until men feel that they owe everything to God, that they are cherished by his paternal care, and that he is the author of all their blessings, so that nought is to be looked for away from him, they will never submit to him in voluntary obedience; nay, unless they place their entire happiness in him, they will never yield up their whole selves to him in truth and sincerity. (John Calvin, Institutes, Book 1, Chapter II)

Happiness Beyond This World

No man will indeed calmly and quietly submit to bear the cross, but he who has learnt to seek his happiness beyond this world, so as to mitigate and allay the bitterness of the cross with the consolation of hope. (John Calvin, commentary on Romans 12:12, commentary on Romans)