What is the validity of defining faith as speech and action that increases and decreases?

Question:
May Allah reward you, Honorable Shaykh. This is a question that has been asked many times. One of them says: There are those who define faith as speech and action that increases and decreases, increasing as much as Allah wills and decreasing until it becomes less than the weight of a mustard seed of faith. Is this definition incomplete or correct?

Answer:
It is incomplete because it leaves out part of the definition. Faith is speech, belief, and action, not just belief and action, or speech and action, but rather the combination of these things: speech with the tongue and action with the limbs. As for it increasing and decreasing, these are two attributes of faith, two attributes of faith. This is a refutation of the Murji'ah, because the Murji'ah say that faith does not increase or decrease; faith is in the heart and does not increase or decrease. This is a refutation of them. Yes.