Johann Arndt said this quote

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

The obedience of Christ was far more acceptable to God, than the innocence of Adam; so that a thousand such as Adam could not have equalled Christ alone. For however he, had he continued in the state of innocence, would have left us an hereditary righteousness, of which we should have been possessed: notwithstanding, unspeakably greater, and more excellent, is our union with God in Christ, since he being made man, hath so purified and exalted the human nature in himself, that the primitive state of Adam is not once to be compared with it.

~ Johann Arndt

Let therefore this PURE LOVE OF CHRIST prompt thee to all that is good; let this be the motive of mortifying thy flesh with all its desires: and let the remembrance of that death which he most willingly accepted for thee, make thee willing to lay down thy life for him; and out of sincere gratitude for all his inestimable benefits, to accept the cross at his hand, and to resist sin and the world even unto blood.

~ Johann Arndt

Nay, we sometimes proceed so far as to trust in ourselves, and depend on our own power, strength, and abilities. Then it is that God in mere mercy interposes, and breaks us in pieces; humbles, and confounds us, and so empties us of ourselves, that we may be filled with all the fullness of God. Which we cannot be, without being first emptied of that arrogance and self-conceit which stand in perfect opposition to the grace of God. Hence it appears that hope is a MILITANT VIRTUE, fighting against all that confidence in ourselves; all that self-exaltation upon the score of our own gifts, merits, righteousness, prosperity, honours, and riches, in which the natural man reposes all his confidence. The business of hope is to oppose and conquer all these delusions of the devil, and to seek its rest in the sanctuary of God.

~ Johann Arndt