But the God of all grace, who hath called us unto his eternal glory by Christ Jesus,
after that ye have suffered a while, make you perfect, stablish, strengthen, settle you." 1 Peter 5:10
The spiritually mature are very good, as well.
But, they are not perfect.
Learn to know the sense of how the word was being used.
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,