Scrupulosity is the pathological guilt/anxiety about moral or religious issues. Although it can affect nonreligious people, it is usually related to religious beliefs. It is personally distressing, dysfunctional, and often accompanied by significant impairment in social functioning. It is typically conceptualized as a moral or religious form of obsessive–compulsive disorder (OCD). The term is derived from the Latin scrupus, a sharp stone, implying a stabbing pain on the conscience. Scrupulosity was formerly called scruples in religious contexts, but the word scruple now commonly refers to a troubling of the conscience rather than to the disorder.

Alphonsus Liguori, CSsR, sometimes called Alphonsus Maria de Liguori or Saint Alphonsus Liguori, was an Italian Catholic bishop, spiritual writer, composer, musician, artist, poet, lawyer, scholastic philosopher, and theologian. He founded the Congregation of the Most Holy Redeemer, known as the Redemptorists, in November 1732.