One of the earliest texts of this tradition is the "Saṃdhinirmocana Sūtra" which might be as early as the first or second century CE. It includes new theories such as the basis-consciousness ("ālaya-vijñāna"), and the doctrine of representation-only ("vijñapti-mātra") and the "three natures" ("trisvabhāva"). However, these theories were not completely new, as they have predecessors in older theories held by previous Buddhist schools, such as the Sautrāntika theory of seeds ("bīja") and the Sthavira nikāya's Abhidharma theory of the bhavanga. Richard King has also noted the similarity of the Sautantrika representationalism and the Yogacara: