St Gregory of Nazianzos…writes: “The tree, in my vision of things, is divine contemplation, which only those established in a high degree of perfection can safely approach, while it is not good for those who are still immature and greedy in their desires, just as solid food is not good for those who are yet tender and have need of milk.”
But even if you do not want to refer that tree and its fruit anagogically to divine contemplation, it is not difficult, I think, to see that eating its fruit was of no benefit to our ancestors, since they were still immature. In my opinion they saw that the tree was the most attractive in paradise to look at and to eat from. But the food most pleasant to the senses is not truly and in every way good, not is it always good, nor good for everyone. Rather it is good for those who can make use of it without being mastered by it, and then only when it is necessary and to the extent that it is necessary, and for the glory of Him who made it; but it is not good for those who are unable to make use of it in such a manner.
~St Gregory Palamas (Philokalia vol.4, p.369)
Prayerful Life 