Be true to thine own self.

The invention of writing will produce forgetfulness in the minds of those who learn to use it, because they will not practice their memory. Their trust in writing, produced by external characters which are no part of themselves, will discourage the use of their own memory within them. You have invented an elixir not of memory, but of reminding; and you offer your pupils the appearance of wisdom, not true wisdom.

By all implies marry if you get a great wife/husband, you are going to be pleased. If you get a bad a single, you are going to become a philosopher.

The envious person grows lean with the fatness of their neighbor.

Not by wisdom do they [poets] make what they compose, but by a gift of nature and an inspiration similar to that of the diviners and the oracles.

The greatest flood has the soonest ebb; the sorest tempest the most sudden calm; the hottest love the coldest end; and from the deepest desire oftentimes ensues the deadliest hate.

Our prayers should be for blessings in general, for God knows best what is good for us.