"Sin is lawlessness." I John 3:4 (R. V.)
"All unrighteousness is sin." I John 5:17.
"An high look, and a proud heart... is sin." Prov. 21:4.
"The thought of foolishness is sin." Prov. 24:9.
"Whatsoever is not faith is sin." Rom. 14:23.
"To him that knoweth to do good, and doeth it not, to him it is sin." James 4:17.