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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Eryxias by Platonic Imitator: are needed, and good for others.
SOCRATES: But can a bad thing be used to carry out a good purpose?
CRITIAS: I should say not.
SOCRATES: And we call those actions good which a man does for the sake of
virtue?
CRITIAS: Yes.
SOCRATES: But can a man learn any kind of knowledge which is imparted by
word of mouth if he is wholly deprived of the sense of hearing?
CRITIAS: Certainly not, I think.
SOCRATES: And will not hearing be useful for virtue, if virtue is taught
by hearing and we use the sense of hearing in giving instruction?
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