The great barrier to worship among God's people is not that we are always seeking our own satisfaction, but that our seeking is so weak and half-hearted that we settle for little sips at broken cisterns when the fountain of life is just over the next hill.
John PiperWe give glory to God when we trust him to do what he has promised to do-especially when all human possibilities are exhausted. Faith glorifies God. That is why God planned for faith to be the way we are justified.
John PiperEvery Christian who struggles with depression struggles to keep their hope clear. There is nothing wrong with the object of their hope - Jesus Christ is not defective in any way whatsoever. But the view from the struggling Christian's heart of their objective hope could be obscured by disease and pain, the pressures of life, and by Satanic fiery darts shot against them... All discouragement and depression is related to the obscuring of our hope, and we need to get those clouds out of the way and fight like crazy to see clearly how precious Christ is.
John PiperWhat 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 Piper