dikaios is the Greek word for righteous or just in Heb. 10:38.  But My righteous will live of faith.  How do I live?  I am living by faith.  My sinful nature was replaced by the divine nature of God.  A sinner has the nature of sin and when I commit sin I am operating out of the nature that is within my spirit.  When I live my righteousness it operates by faith.  Sin vs. faith…both natures.  I cannot walk out the divine nature and declare, “I am a sinner saved by grace.”  I am not “dual-natured”…I walk out the divine nature inside of me…1Jn. 3:9 God cannot sin, He lives in me….I learn to walk out the power of that divine nature within me….I walk in my righteousness…when I apply the Word of God in my life…standing on His promises…. this then ignites or releases the power of the divine nature within me.