How would you say the evangelical church defines authority different from what is the main authority for the roman catholic? James White answers

Sola Scriptura - scripture alone is the final authority because it alone is the preserved revealed word of God which is infallible.

Sola Ecclesia - church alone is the final authority receiving additional revelation to scripture about sacred tradition (unwritten words of Jesus) infallibly explaining the meaning of scripture, the application of scripture, the canon of scripture, and practices (each infallibly).

James White from Alpha & Omega Ministries

http://www.aomin.org/aoblog/2010/01/10/sola-ecclesia-defined-and-illustrated/

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2 Timothy 3:16-17

All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness, that the man of God may be complete, equipped for every good work.

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