Namaste, पातञ्जलयोगसूत्राणि vide समाधि पादः (shloka no. 26) mentions : स पूर्वेषाम् अपि गुरुः कालेनानवच्छेदात् ... He (Ishwara) is the Teacher of all Ancient Teachers, being not limited by Time. So, Ishwara = Guru rgs, sriram