We make no apology that our only foundation is the complete sufficiency of Scripture.
2 Timothy 3:16-17 "All Scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness, (17) that the man of God may be complete, thoroughly equipped for every good work."
2 Peter 1:2-4 Grace and peace be multiplied to you in the knowledge of God and of Jesus our Lord, (3) as His divine power has given to us all things that pertain to life and godliness, through the knowledge of Him who called us by glory and virtue, (4) by which have been given to us exceedingly great and precious promises, that through these you may be partakers of the divine nature, having escaped the corruption that is in the world through lust.
God has graciously revealed everything we need to know about Him, this universe & ourselves in the Bible. Everything a person needs to know in order to come to salvation & then live the Christian life as God intended it, is in the Bible!
Only the Bible is inspired. There is no other "Sword of the Spirit." The Bible is truth.