The really important thing is not to live, but to live well. And to live well meant, along with more enjoyable things in life, to live according to your principles.
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Source, in full
Presented as a full Socrates quote by various sources like this page, the first sentence of the quote is indeed attributed to Socrates in Plato's dialogue The Apology, but the second sentence is a description of Socrates' beliefs by Robert C. Solomon in his 1989 book Introducing Philosophy: A Text With Integrated Readings, from p. 4 (the comment is in the last paragraph on p. 3 of the 2012 edition which can be rented from archive.org).