The Gospel alone is our Mother

 Galatians 4:23 talks about the wives of Abraham. The one was a slave, the other was a free woman.

Then in v. 24 and 25, Paul says that these women were allegorical to the realities they represented, for they represented two covenants. Agar represented Mt. Sinai, and it's bondage of the law.

In v. 26, Jerusalem which above is free, which is the mother of us all. This is the covenant of grace. In other words, this is the gospel that has begotten us. God in Christ is our Father, who alone teaches us all things necessary for our salvation, and the gospel alone is our mother who makes us alive with Christ, and sits us with him in the heavenly realms.

Only the Gospel, not the Law, Saves

"The book of Judges speaks to all who are, by God's grace, given 'an ear to hear' God's message for our own day and our present condition, individually and as a nation. The message is one of the need for personal faith in the living God. And this, in the light of the whole Scripture, means nothing less than hearing Paul's words to the Philippian jailor: 'Believe on the Lord Jesus Christ and you will be saved.' The society in which we live gives abundant and appalling evidence of the kind of spiritual and moral decay which kindled the anger of God against his own people and the heathen nations around them. Three millennia have passed since then, but human nature is in the same need as ever it was. But the Lord has not changed either: Jesus has come and died upon the cross as the once for-all sacrifice for sin. He has risen triumphant over death and the grave and reigns in glory as the Lord of all. His arm is not shortened that it cannot save. His message is one of hope and of victory for a darkening world." - Gordon J. Keddie, Even in Darkness, Pg. 2

Justification by Faith alone

"Nay, justification is made by this onely motion, wherby the mind through faith is so moved unto God, that it taketh hold of his good will, reconciled by Christs satisfaction to all that beleeve in him" - Johannes Piscator, A learned and profitable Treatise of Mans justification Two Books, pg. 68

No Justification because of works before grace or works after grace

Johannes Piscator, "The Apostle derogates justification not only from those works which are done before faith, but also from those which are done after faith. For he speaks of Abrahams works, which are mentioned in Scripture for to show his uprightness as that he obeyed God going out of his own country, and offered his son. But works which Abraham did beore faith, are mentioned in the Scripture, not as such whereof he might rejoice, but as such whereo he might worthily be ashamed: namely, that he served strange gods, Josh. 24.2."

No man is so great a sinner that he cannot be saved

"I say that no man is so great a sinner, if he repent and believe, but that he is righteous in Christ and in the promises: yet if thou look on the flesh and unto the law there is no man so perfect that is not found a sinner. Nor any man so pure, that hath not somewhat to be yet purged." - William Tyndale, The Obedience of a Christian Man, pg. 59

It is not by our self-righteous works we are saved but solely the imputed righteousness of Christ alone

"If God promises riches, the way thereto is poverty. Whom he loveth him he chasteneth, whom he exalteth, he casteth down, whom he saveth he damneth first. He bringeth no man to heaven except he send him to hell first. If he promise life he slayeth first, when he buildeth, he casteth all down first. He is no patcher, he cannot build on another man's foundation. He will not work until all be past remedy and brought unto such a case, that men may see how that his hand, his power, his mercy, his goodness and truth hath wrought all together." -William Tyndale, The obedience of a Christian Man