I would take you up on that challenge.
Constantly, in Scripture; you find Jesus and others appealing to Scripture alone to support what they are saying.
Jesus chastised some saying :"Mat 22:29 Jesus answered and said unto them, Ye do err, not knowing the scriptures, nor the power of God." (Repeated Mark 12:24)
But, I will give you this. Without God's help, one can not truly understand Scripture.
Luk 24:45 Then opened he their understanding, that they might understand the scriptures...
1Cr 2:14 But the natural man receiveth not the things of the Spirit of God: for they are foolishness unto him: neither can he know [them], because they are spiritually discerned.
Still, this does not negate one's responsibility to dig into God's Word. Jesus commanded it:Jhn 5:39 Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me.
Paul reasoned from them (not tradition, Scripture)Act 17:2 And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures, and prised those who searched the Scripture: Act 17:11 These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
They are our source of Hope
Rom 15:4 For whatsoever things were written aforetime were written for our learning, that we through patience and comfort of the scriptures might have hope.
They are our source of soteriology 2Ti 3:15 And that from a child thou hast known the holy scriptures, which are able to make thee wise unto salvation through faith which is in Christ Jesus
And, they testify of Jesus Himself and how He fulfilled the prophecies concerning Him in Scripture.
Only Satan Himself would cause you to back away from studying Scripture.
Don't let him win.
-A8
And you find me appealing to scripture, as is every Catholic. Show me where does it say that scripture governs alone in the sense in which you use the phrase: so that, putatively, if something is not in the scripture than it cannot be taught as doctrine.