Hearken unto me, ye that know righteousness, the people in whose heart is my law; fear ye not the reproach of men, neither be ye afraid of their revilings. (Isaiah 51:7)
Those who “know righteousness” are here defined as having the law of God—a transcript of His character—in their hearts. His revealed will (see on v. 4) is etched upon their minds, and in character they are like Him (see Gal. 2:20; Col. 1:27; 1 John 3:2, 3).