Catholics should head the scripture.
Matthew 15:9 But in vain they do worship me, teaching for doctrines the commandments of men.
2 Timothy 3:16,17 - All Scripture is inspired by God and profitable for teaching & furnishing to all good works.
Not so tradition.
No its not. Scripture references Scripture, but it NEVER says Scripture Alone. As a matter of fact Scripture never defines Scripture or provides a Table of Contents. The Bible only exists because the Church wanted to establish a Lectionary to identify which writings it felt were legitimate to be read during the Liturgy of the Word in the Mass.
"No other source has proven infallibility.
When we see through the eyes of faith earthly proof is not needed. If you have faith why do you need proof?