The best excerpt that explores the idea that people should love and be loved while they are still living is To love that well which thou must forsake ere long.
Shakespeare frequently uses a final couplet in his sonnets. The final line of this sonnet expresses the poem's concept. To love those things that you must leave behind before long is what the speaker means when he says, "to love that well which thou must forsake ere long." The underlying notion is that everything must eventually depart since that is how death operates. However, they should be loved before you or other things depart. The sonnet's final line perfectly illustrates this idea.
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