Yoga Sūtra Chapter Three verse 15

krama-anyatvaṃ pariṇāma-anyatve hetuḥ ||15||

Another sequence is the cause of another transformation.

krama - sequence; order; series; regular arrangement; succession; progressing step by step; in regular course; gradually, by degreesanyatva - anotherpariṇāma - transformationhetu - cause