The Tree of Life I believe to be symbolically a reference to Adam.
The tree of life is mentioned several times in Bible.
ie Prov. 13:12 "Hope deferred makes the heart sick, but a desire fulfilled is a tree of life."
Although not mentioned anywhere else in Bible I think "Tree of Knowledge of Good & Evil" symbol for Eve.
The fruit of the "Tree of Knowledge" ie Eve's love could be either God centred or self-centred as it became when Eve was tempted by satan.