John Piper said this quote

Life is not a straight line leading from one blessing to the next and then finally to heaven. Life is a winding and troubled road. Switchback after switchback. And the point of biblical stories like Joseph and Job and Esther and Ruth is to help us feel in our bones (not just know in our heads) that God is for us in all these strange turns. God is not just showing up after the trouble and cleaning it up. He is plotting the course and managing the troubles with far-reaching purposes for our good and for the glory of Jesus Christ.

~ John Piper

... the mind was designed not to defend what we want, but to discover what is ultimately true, which should shape our wants and satisfy them more deeply with God. The purpose of the mind is not to rationalize subjective preferences, but to recognize objective reality and to help the heart revel in God.

~ John Piper

In all of knowable reality, God is unique. He is knowable not like the multiplication table or the table of elements; he alone is knowable as the one totally in control of being known. He is not at the disposal of the human mind. He is known when he wills to be known. Yet he is known in and through created reality, which is known naturally. Therefore the glory of God is exalted most not when we know God apart from observation and reading and study, but when we know God as a result of his free and gracious self-revelation in and through our earnest observation of and meditation on his work and Word in history.

~ John Piper

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 Piper