Speaking of the pre-fall Eden, Calvin writes:
The Holy Spirit also designedly relates by Moses the greatness of Adam’s happiness, in order that his vile intemperance might the more clearly appear, which such superfluity was unable to restrain from breaking forth upon the forbidden fruit. And certainly it was shameful ingratitude, that he could not rest in a state so happy and desirable: truly, that was more than brutal lust which bounty so great was not able to satisfy. No corner of the earth was then barren, nor was there even any which was not exceedingly rich and fertile: but that benediction of God, which was elsewhere comparatively moderate, had in this place poured itself wonderfully forth. For not only was there an abundant supply of food, but with it was added sweetness for the gratification of the palate, and beauty to feast the eyes. Therefore, from such benignant indulgence, it is more than sufficiently evident, how inexplicable had been the cupidity of man.
He gave the tree of life its name, not because it could confer on man that life with which he had been previously endued, but in order that it might be a symbol and memorial of the life which he had received from God. For we know it to be by no means unusual that God should give to us the attestation of his grace by external symbols.