Not To Be Confused With
The solas are a later summary (the fivefold list is modern) of Reformation convictions, not a creed any reformer signed. Each 'alone' excludes a rival ground, not the other solas.
Sola Scriptura, sola gratia, sola fide, solus Christus, soli Deo gloria. Together they frame the Reformation's answer to medieval Catholicism: salvation by God's grace alone, through faith alone, in Christ alone, known from Scripture alone, for God's glory alone.