Answer: The difference between them lies in the depth that is revealed to a person. Since the meaning itself derives from the creature, it includes several components. We call faith a degree of bestowal contained in the act performed by the will to receive pleasure (desire). Attainment is what a person learns while performing the act of bestowal in the degree of its similarity to the Light.
From the 2nd part of the Daily Kabbalah Lesson12/8/10, “Introduction to the Study of the Ten Sefirot“