Isaiah 1:19 If ye be willing and obedient, ye shall eat the good of the land 20 But if ye refuse and rebel, ye shall be devoured with the sword: for the mouth of the Lord hath spoken it.
[Patriarchs & Prophets pp 53] Like the angels, the dwellers in Eden had been placed upon probation; their happy estate could be retained only on condition of fidelity to the Creator's law. They could obey and live, or disobey and perish. God had made them the recipients of rich blessings; but should they disregard His will, He who spared not the angels that sinned, could not spare them; transgression would forfeit His gifts and bring upon them misery and ruin. The angels warned them to be on their guard against the devices of Satan, for his efforts to ensnare them would be unwearied.
While they were obedient to God the evil one could not harm them; for, if need be, every angel in heaven would be sent to their help. If they steadfastly repelled his first insinuations, they would be as secure as the heavenly messengers. But should they once yield to temptation, their nature would become so depraved that in themselves they would have no power and no disposition to resist Satan. The tree of knowledge had been made a test of their obedience and their love to God.
The Lord had seen fit to lay upon them but one prohibition as to the use of all that was in the garden; but if they should disregard His will in this particular, they would incur the guilt of transgression. Satan was not to follow them with continual temptations; he could have access to them only at the forbidden tree. Should they attempt to investigate its nature, they would be exposed to his wiles. They were admonished to give careful heed to the warning which God had sent them and to be content with the instruction which He had seen fit to impart.
Deuteronomy 4:40 Thou shalt keep therefore his statutes, and his commandments, which I command thee this day, that it may go well with thee, and with thy children after thee, and that thou mayest prolong thy days upon the earth, which the Lord thy God giveth thee, for ever.
May The Lord add His blessing to the study of His word. God bless!