Beware of self-righteousness!

J. C. Ryle

"We have all become like one who is unclean, and all
 our righteous deeds are like a polluted garment.
 We all fade like a leaf, and our iniquities, like the
 wind, take us away." Isaiah 64:6

Beware of self-righteousness in every possible 
shape and form. Some people get as much harm 
from their 'virtues' as others do from their sins.

Oh, let us beware of self-righteousness! Open sin 
kills its thousands of souls. Self-righteousness
kills its tens of thousands!

"There is none righteous, no, not one." Romans 3:10