The Infirmity of the Flesh
A Sermon on Romans 6:19
I am speaking in human terms, because of your natural limitations. For just as you once presented your members as slaves to impurity and to lawlessness leading to more lawlessness, so now present your members as slaves to righteousness leading to sanctification. (ESV)
The use of analogy; willing slavery; the infirmity of the flesh; spiritual discernment; growth in understanding.