Tzadik is like G-d's Altar

 Ramchal (Mesilas Yesharim 26) But for the Holy man who constantly clings to his G-d, whose soul treads freely among true thoughts in love of his Creator and fear of Him, behold, it is considered as if he is walking before G-d in the Land of the Living, while still here in this world. Such a man is himself considered as a tabernacle, a temple and an altar. This is as our sages said  "'and G-d went up from him'  - the forefathers are the divine chariot". Likewise, they said: "the righteous are the divine chariot". For the Shechina (divine presence) dwells within them just as it dwelled in the Temple. Due to this, the food they eat is like a sacrifice offered upon the fire of the altar, for certainly it was a great elevation for those things to be offered on the altar, since they were offered before the Shechina. The elevation was to such an extent that its kind, all over the world, was blessed, as our sages stated in a Midrash. So too, the food and drink which the holy man eats elevates that food or drink as if it had actually been offered on the altar. This is similar to what our sages said: "one who brings a gift to a Torah scholar is as if he had offered first-fruits ", and "if a man wishes to offer a wine libation upon the altar, let him fill the throat of the Torah scholars with wine". This does not mean that Torah scholars were craving for food and drink, G-d forbid, that one fills their throats like one stuffs a glutton. Rather, the matter is according to the intent I explained. That Torah scholars who are holy in their ways and in all their deeds are actually just like the Temple and the altar, for the Shechina (divine presence) literally dwells upon them as it did in the Temple. Thus, what is offered to them is as offered on the altar, and the filling of their throat is as the filling of the basins. In this way was all use they made of the things of this world. Since they were clinging to G-d's holiness, blessed be He, behold, it was an elevation and an enhancement for that thing which merited to be of use to a Tzadik (righteous person).