Webster's Dictionary 
(1): ( a.) Self-sufficient; self-satisfied; content.
(2): ( a.) Possessing adequate talents or accomplishments; of competent power or ability; qualified; fit.
(3): ( a.) Capable of meeting obligations; responsible.
(4): ( a.) Equal to the end proposed; adequate to wants; enough; ample; competent; as, provision sufficient for the family; an army sufficient to defend the country.
King James Dictionary 
Suffi'Cient, a. L. sufficiens. Enough equal to the end proposed adequate to wants competent as provision sufficient for the family water sufficient for the voyage an army sufficient to defend the country.
My grace is sufficient for thee. 2 Corinthians 12
1. Qualified competent possessing adequate talents or accomplishments as a man sufficient for an office. 2. Fit able of competent power or ability.
Who is sufficient for these things? 2 Corinthians 2