Isaiah 51:7

To know righteousnessdoes not differ in meaning from "follow after righteousness" in Isaiah 51:1. Both expressions refer to righteousness in the ethical sense; there it is represented as an ideal steadily pursued, here as a rule of life apprehended by the heart and conscience. This inward possession of righteousness is the earnest of the external righteousness, the vindication of right, spoken of in Isaiah 51:6; Isaiah 51:8.

the people in whose heartis my instruction] Cf. Jeremiah 31:33.