How we cite our quotes: (Line)
Quote #1
One day I wrote her name upon the strand,
But came the waves and washed it away:
Again I wrote it with a second hand,
But came the tide, and made my pains his prey. (1-4)
Love makes us do silly things, like grab sticks and write our significant others' names in the sand. Love even makes us do silly things like this twice. Love makes suckers of us all.
Quote #2
"Not so," (quod I) "let baser things devise
To die in dust, but you shall live by fame:
My verse your vertues rare shall eternize,
And in the heavens write your glorious name: (9-12)
What's more romantic than your dude telling you that "you['ll] live by fame" because of your "vertues rare"? Back in the day: not much. Sure, some girls dig roses and chocolates, some girls might like to receive a rad dirt bike as an expression of love, but our speaker's hoping that he can flatter his girl with some verses (i.e., with some sonnets, like the sonnet you just finished reading).
Quote #3
Where whenas death shall all the world subdue,
Our love shall live, and later life renew." (13-14)
In this final couplet, with its lovely rhyme that provides a sense of closure, we find out that it's not just the beloved who will live on through poetry. Our speaker will too, because it's the love that "shall live, and later life renew." It's not so much "my heart will go on," but, "our hearts will go on" in "Sonnet 75."