1.a) 60b: Socrates remarks that pain and pleasure may seem to be opposites since we never experience both at the same time, but they are intimately connected to one another. Rarely, do we find one without the other. The pleasure that he experiences from being released from his chains is directly related to the pain that he experienced from being enchained.
b) 67b: Death is the separation of the soul from the body. We shall be closest to knowledge (in live) if we refrain as much as possible from association with the body and do not fall to bodily pleasures but live a purified life. Philosophers are only concerned with the well-being of their souls and the best kind of wisdom comes from reason alone, when distanced as far as possible from the distractions of the body. Opposites contrasted by each other, each is necessary for the recognition of the other.
c) 68b: Only a philosopher who does not fear death can truly be said to possess courage and self-control. The philosopher exchanges pleasures for pleasures, pains for pains, fears for fears for wisdom, which is the only thing of true value. This pursuit of wisdom will cleanse the philosopher of all the impurities of bodily life and its passions, preparing him for a better afterlife with the gods. Contrary properties from different points of view.
d) 70d: Argument from Opposites. Everything comes to be from its opposite. For example, for an object to become bigger, it must have become smaller beforehand and has become bigger out of this smallness. There are two forms of generation between opposites, where each opposite comes into being out of the other opposite. Between big and small there are the processes of increase and decrease. Opposites contrasted by each other, each is necessary for the recognition of the other.
e) 72b: Transmutation of elements. There is opposite to living. Being dead is opposite to living. All dead things go from being...