The Consequences of Disobedience
What happened when Adam and Eve ate of the forbidden fruit and why did God forbid it in the first place? The tree of the knowledge of good and evil was adequately named. The result of eating its fruit was that one would acquire this knowledge. So, when Adam and Eve ate the fruit, they did, as a result, have knowledge of good and evil. Before they ate the fruit from the tree Adam and Eve knew only good. They knew God and walked daily in sweet communion with Him. They walked naked before Him and knew no shame because evil was non-existent for them up until that point. The result of eating the fruit (which God had warned them ahead of time not to do) was that their eyes were opened to evil and they recognized their own nakedness and need for covering.
This instituted the process of man being separated from God and, therefore, the need for a covenant in order to come back into relationship with Him. The very first act of God after their disobedience was that He gave them the physical covering they needed. He provided for their need.
"The Lord God made garments of skin for Adam and his wife and clothed them."
These skins required the need for an animal to be sacrificed thus the first animal sacrifice was made. From that point on God repeatedly shows in increasingly revelatory fashion the need for man to have his sin covered. He demonstrates the need for and establishes a covenant relationship through Noah, Abraham and Moses all of which foreshadow and point to the everlasting covenant established through the death of Jesus on the cross and the shedding of His perfect, holy and righteous blood. The shed blood of Christ was necessary in order for man to have everlasting life and be able to live for all eternity in relationship with God. This perfect and holy self-sacrifice was the only one that could stand as a substitutionary death for us so that we are no longer condemned. His death was required as a substitution for each of ours.
When we obey God's commands we receive goodness and reward, but in disobedience there is always a price to pay...even if it is just the simple fact that we now know evil. God desires what is good for us and always tells us in advance, but as a loving Father, He also allows us to make our own choices...anything else would be slavery. We are not slaves to God, but we should always keep in mind that the direct result of choosing to not obey God is that we are choosing to be slaves to sin and evil.
If the result of disobedience is separation from God and slavery to sin and death then why would anyone willingly choose it? If knowing God means knowing freedom, every perfect pleasure and delight and absolute fulfillment then why would we want anything less? If you have to be a slave to one or the other then why not choose the one that leads to life, fulfillment, joy, peace, and the truest and purest of pleasures and delights for all of eternity?