The possession of knowledge understood as the full set of essences, and probably also a fair number of the principles that govern causal networks, provides rational control: a chance at understanding the cosmos, providing, thus, if not a point of manipulation of that same cosmos (on this there is a scholarly disagreement), at least an insight into its workings and embedded value hierarchies.
self-knowledge -> rational control, liberate from outside things that are out of control
But there are other ways in which such a friendship needs to avoid being a manifestation of improper self-love.
If there is anything in Kierkegaard’s suggestion that the category of the neighbour is best placed to draw our attention to this alterity, then such a focus enables us to see another dimension of how agapic love of neighbour might positively inform friendship.
how agapic love of neighbour positively inform friendship: alterity他者性。Classical description of friendship downplays alterity and the need for others ( sufficiency )
In other words, your friends may well enhance your self-awareness and self-understanding, but there is no reason to suppose they necessarily do this in virtue of their likeness to you.
但前提是你要有自省和智慧的virture啊！你要能发现自己和朋友的长处和短处