Johann Arndt

“For true conversion doth not consist in putting away great and outward sins only, but in descending deeply into your own self, searching into the inmost recesses of the heart, the secrets and closets, all the windings and turnings thereof; changing and renewing them throughout, with the grace that is given you: and so, by faith, you are converted from self-love to Divine love; from the world and all worldly concupiscences, to a spiritual and heavenly life; and from a participation of the pomps and pleasures thereof, to participating the merits and virtues of Christ, by believing his word, and walking in his steps.”
― Johann Arndt, Johann Arndt: True Christianity

“The first help to prayer is our only Mediator and Advocate, Jesus Christ, the Son of God, 1 John 2:2. He is pleading our cause before God, when we are hardly able to express what we want; who is therefore called the Word of the Father, because God, by him, has discovered his will to us; as he is also called 'the Mediator,' because he solicits our cause before God. When Moses complained that he was of slow speech, and a slow tongue, that so he might avoid carrying the commanded message to Pharaoh, God tells him, 'Aaron thy brother can speak well, he shall be to thee instead of a mouth.' Se we also, when we shall pray, are dull, and slow of speech, and therefore must fly to Christ, our heavenly Aaron, who is to us instead of a mouth. Therefore Christ commands us to pray in his name, who is our eternal High-priest, 'having an everlasting priesthood,' (Heb. 7:24,) 'interceding for us,' (Rom. 8:34,) 'in whom we have boldness,' and access with confidence by the faith of him,' Eph. 3:12.”
― Johann Arndt, True Christianity