What is sin? It is the glory of God not honored. The holiness of God not reverenced. The greatness of God not admired. The power of God not praised. The truth of God not sought. The wisdom of God not esteemed. The beauty of God not treasured. The goodness of God not savored. The faithfulness of God not trusted. The commandments of God not obeyed. The justice of God not respected. The wrath of God not feared. The grace of God not cherished. The presence of God not prized. The person of God not loved. That is sin.
John PiperThe great danger of riches is that our affections will be carried away from God to His gifts.
John PiperThe highest mental health is not liking myself but being joyfully interested in everything but myself.
John PiperThe line of lovelessness is not drawn between speaking and doing, but between speaking and doing in the truth, and speaking and doing in emptiness. Truth turns word-love into deed-love.
John PiperWe can be content with simplicity because the deepest most satisfying delights God gives us through creation are free gifts from nature and from loving relationships with people. After your basic needs are met, accumulated money begins to diminish your capacity for these pleasures rather than increase them. Buying things contributes absolutely nothing to the heart's capacity for joy.
John PiperThe task of all Christian scholarshipโnot just biblical studiesโis to study reality as a manifestation of Godโs glory, to speak and write about it with accuracy, and to savor the beauty of God in it, and to make it serve the good of man. It is an abdication of scholarship when Christians do academic work with little reference to God. If all the universe and everything in it exist by the design of an infinite, personal God, to make his manifold glory known and loved, then to treat any subject without reference to Godโs glory is not scholarship but insurrection.
John Piper