"...You want to see a legalist, take a look in the mirror. Deep in the heart of all of us is the proud desire to prove ourselves. SIn is wanting to live our lives our own way without God...the battle of legalism takes place every day in our hearts." - Tim Chester {You Can Change}.
So you also must consider yourselves dead to sin and alive to God in Christ Jesus. Let not sin therefore reign in your mortal body, to make you obey its passions.
{Romans 6:11-12}