Mbh 12.342.4c

Those ordinances should always be adored, and it is, therefore, that I adore them. He who knows Rudra knows myself, and he who knows myself knows Rudra. He who follows Rudra follows me, Rudra is Narayana. Both are one; and one is displayed in two different forms. Rudra and Narayana, forming one person, pervade all displayed things and cause them to act. No one else than Rudra is competent to grant me a boon, O son of Pandu. Having settled this in my mind, I adored in days of yore the ancient and puissant Rudra, for obtaining the boon of a son. In adoring Rudra thus I adored my own self. Vishnu never bows his head unto any deity except his own self. It is for this reason that I adore Rudra, (Rudra being, as I have already told thee, my own self). All the deities, including Brahma and Indra and the deities and the great Rishis, adore Narayana, that foremost of deities, otherwise called by the name of Hari. Vishnu is the foremost of all Beings past, present, or future, and as such should always be adored and worshipped with reverence. Do thou bow thy head unto Vishnu. Do thou bow thy head unto Him who gives protection to all. Do thou bow, O son of Kunti, unto that great boon-giving deity, that foremost of deities, who eats the offerings made unto him in sacrifices. I have heard that there are four kinds of worshippers, viz., those who are eager for a religious life, those who are enquirers, those who strive to comprehend what they learn and those who are wise. Among them all, they that are devoted to realising the self and do not adore any other deity, are the foremost. I am the end they seek, and though engaged in acts, they never seek the fruits thereof. The three remaining classes of my worshippers are those that are desirous of the fruits of their acts. They attain to regions of great felicity, but then they have to fall down therefrom upon the exhaustion of their merits.