High Quality Content by WIKIPEDIA articles! Legalism, in Christian theology, is a usually-pejorative term referring to an over-emphasis on discipline of conduct, or legal ideas, usually implying an allegation of misguided rigour, pride, superficiality, the neglect of mercy, and ignorance of the grace of God or emphasizing the letter of law over the spirit. Legalism is alleged against any view that obedience to law, not faith in God`s grace, is the pre-eminent principle of redemption.