“The L-RD G-d took the man and placed him in the garden of Eden, to till it and tend it.” – Genesis 2:15, JPS 1985 Tanach
Adam was given the responsibility to avdah (work) and shomer (guard) the garden of Eden. Yet, not until after Adam and Chava were expelled from Gan Eden, was he commanded to till the earth outside of the garden. The question may be asked, what was the essential difference between his responsibilities in regard to Gan Eden, and what comprised his role, once expelled?
A union with G-d (yichud, in Hebrew) constituted the existential nature of life in Gan Eden. Yet, that perfect relationship of oneness with G-d was broken by disobedience, having partaken from the Tree of Knowledge of Good and Evil. When both Adam and Chava had partaken of the fruit of the Tree of Knowledge, they became self-aware, because the unity with G-d was interrupted.
As a result, existentially outside of Paradise, even before being officially expelled, their existence was disrupted by their own sin. In other words, they no longer were within the domain of perfect correspondence with the various components of Gan Eden. Sin, shame, and rebellion had entered into the picture, thereby disrupting peace and contentment.
Thus, within the garden, prior to the aveirah (sin), a G-d centered focus permeated every act, in regard to their endeavors. As explained elsewhere, that avdah refers to perfection of the soul, as per man being described as a nefesh chaya (literally, living soul; Ibn Ezra). Thereby, the refining of one’s personality is tantamount to the service that is concomitant with gan eden, when doing so under the guidance of H’Shem.
Yet, having been expelled, their lives subsequently encompassed, a self focused reality, wherein one attempts to improve himself, according to his own design, irrespective of the original blueprint. Having already given in to temptation, and partaken of the forbidden fruit, mankind was now subject to the challenges of dealing with his own unruly nature that had been unleashed.
The only way back to the garden is through acknowledgment of our own misguided attempts to continue on the path of independence from G-d; then to realize over time that these attempts are vain, and return to the original blueprint for our lives. This blueprint is known as the Torah, meaning “instruction.” All of kitvei kodesh (holy scripture) is of benefit for this endeavor, as well as listening to our conscience; for, G-d has given us an inner guidance system, with a homing beacon, called the soul.