Fichte's consciousness of the self depends upon resistance or a check by something that is understood as not part of the self yet is not immediately ascribable to a particular sensory perception. In his later 1796–99 lectures (his "Nova methodo"), Fichte incorporated this into his revised presentation of the foundations of his system, where the summons takes its place alongside original feeling, which takes the place of the earlier "Anstoss" (see below) as a limit on the absolute freedom and a condition for the positing of the I.