For if these things be in you, and abound, they make you that ye shall neither be barren nor unfruitful in the knowledge of our Lord Jesus Christ. But he that lacketh these things is blind, and cannot see afar off, and hath forgotten that he was purged from his old sins. (2 Peter 1:8-9 KJV)
What things is this verse talking about? The Christian virtues mentioned in the verses previous:
And beside this, giving all diligence, add to your faith virtue; and to virtue knowledge; And to knowledge temperance; and to temperance patience; and to patience godliness; And to godliness brotherly kindness; and to brotherly kindness charity. (2 Peter 1:5-7 KJV)
This is straight forward in saying that if you lack these qualities, you are barren spiritually, lack knowledge of Jesus Christ, are blind and have forgotten that you are purged from your sins! Wow. That leaves some things to think about.