Since a true satguru is the very personification of the lord the quotes from ancient books on the subject of life and if one worships the physical form of a living saint are also taken as true worship of the lord.
Those who serve the lotus feet of true saints or satguru with all love, devotion, and worship
Got directed to the absolute and omnipresent one who is personified and cause of all animate and inanimate.
It is the pious soul or true saints in whose heart all merciful lord manifest and those who make it to the holy feet of such divine powers cross the ocean of the mundane world, merges back to one from originating, and rejoice in the supreme bliss.
Hare Rama