Reformation Theology is focused upon the Five Solas, which includes: Scripture alone; by grace alone; through faith alone; in Christ alone; to God's glory alone. The Protestant Reformers were united on these five biblical truths.
Scripture Alone. The Reformers believed all true doctrine must be based upon Scripture alone. They recognized that the Bible alone is the Word of God written. Scripture takes precedent over church tradition. That's because Holy Scripture alone is inspired by the Holy Spirit.
By Grace Alone. The Reformers were insistent that salvation is only and always by grace alone. Man can never earn nor deserve his salvation. God's grace alone saves sinners from the condemnation and curse of their sins. Grace is the unmerited favor of God, the gift of God freely given (Ephesians 2:8-9).
Through Faith Alone. Scripture teaches that sinners are justified by God's grace alone through faith alone. Faith is trust in God. In all ages and epochs of history, God has shown mercy to sinners through salvation by grace through faith. Without faith no one has pleased God (Hebrews 11:1-6).
In Christ Alone. Salvation is in Christ alone. He is the express image of God incarnate (Hebrews 1:1-3). Christ Jesus our Lord reveals the fullness of God's grace. The Gospel of Christ is the message of salvation (Romans 1:16). Christ died for our sins. He is risen for our justification. Old Testament believers were saved by the promise of Christ coming. New Testament believers are saved because Christ has come.
To God's Glory Alone. God does all things to His glory alone. He saves sinners to the praise of His glorious grace (Ephesians 1:6, 12, 14). Sinners saved by grace alone give praise to God alone. The purpose of man's life and salvation is to God's glory alone.