All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, thoroughly furnished unto all good works. 2 Timothy 3:16,17 (KJV)
The KJV uses the word "perfect" in place of "competent. According to Webster's 1828 dictionary, perfect in this sense can mean:
Fully informed; completely skilled
Therefore in Christ, through the inspired word of God I can be made perfect!