The Reformers did not return to the sources because they believed the old was better than the new, nor because antiquity possesses authority simply by virtue of its age. They returned to the sources to recover the language and words that were actually written and spoken, especially those by great teachers and, most importantly, God Himself.
The certainty of faith is utter assurance because it depends upon nothing of your own. It is entirely trusting that God is a propitious, pardoning God—the God who justifies sinners by forgiving them.
Sinners get faith as a gift when Christ takes their captivity captive.

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Even if the numbers are bad, the news about Jesus crucified for sinners and raised to new life hasn’t become any less good.
There is a revival, no less real and even more definitive, taking place in every church, every weekend, where God’s people gather around his gifts.
To believe God is love and thus loves you is a miracle wrought by the Holy Spirit.
His love for you is so deep that in his mercy, while you were yet a sinner, God sent his only begotten Son to die for you.
“So loved,” then isn’t about how much but instead simply how.
Love is pointing to Jesus who said, “Greater love has no one than this, that someone lay down his life for his friends” (John 15:13).
Let us not recoil at the sight and sound of the crucifixion. It is the battlefield of victory. It is the throne of the King. It is the symbol of salvation.
Christ our Word, as with a two-edged sword, burst the devil's belly.
Authentic proclamation, then, is the love of Christ for our souls, which we have seen and experienced through the under-shepherd’s pastoral care put into the words of Christ Himself.
The sign of the cross, according to the earliest centuries of Christians, is “the sign of the Lord,” and every baptized Christian was “marked” with it.
The sermon takes place in the context of a multi-facetted set of relationships experienced through the weeks and months of being together in congregation and community. Those relationships shape the credibility of the preacher in the pulpit. 
As the writer to the Hebrews affirms, what makes the Christian gospel so much better is that we are no longer dealing with “types and shadows."