Action and inaction; active and passive; dynamic and static; things and phenomena in general are 有為; nirvāṇaquiescence, the void, etc., are 無為.
瑜伽六十五卷十五頁云：復次由五相故；建立有為諸法差別。何等為五？一、後際未生故，二、前際已滅故，三、中際自相安住故，四、因緣相續故，五、果相續故。又由五相，建立無為諸法差別。何等為五？謂與上相違，應知即是此中五相。