Its Sufficiency
What Does Sola Scriptura Mean? It means that Scripture is
the perfect and only standard of spiritual truth, revealing infallibly all that we must believe in order to be saved and all that we must do in order to glorify God. That—no more, no less—is what sola Scriptura means.
(John MacArthur at Ligonier Ministres Blog)
And from Dr. James Montgomery Boice, a sermon on the sufficiency of Scripture:
Do we really believe that God has given us what we need in this book? Or do we think we have to supplement the Bible with other man-made things? Do we need sociological techniques to do evangelism? Do we need psychology and psychiatry for Christian growth? Do we need extra-biblical signs or miracles for guidance?
(Effectual Grace)
Its Perspicuity
Robert Shaw discusses the perspicuity of Scripture:
If the Scriptures were unintelligible to common Christians, and the interpretation of the Church were necessary to discover their meaning, then such Christians would have no foundation upon which a divine faith could rest. Their faith must be ultimately resolved into the testimony of men; but human testimony, being fallible, cannot be the ground of an infallible persuasion
Quoted from An Exposition of the Westminster Confession of Faith at The Reformed Reader.
The Canon
Now in one place, all of Michael Kruger’s 10 Misconceptions About the New Testament Canon posts (Canon Fodder).