"True friendship multiplies the good in life and divides its evils. Strive to have friends, for life without friends is like life on a desert island... to find one real friend in a lifetime is good fortune; to keep him is a blessing."

This quote is really about how good friends change the math of your life. When something great happens, sharing it with a real friend makes the joy feel bigger and more real. And when something painful happens, having someone who truly cares makes the burden feel lighter, more manageable.
Gracián’s also honest: real friendship is rare. Most of us meet lots of people, but the ones who genuinely show up for us, year after year, are few. Think of that one person you can text at 2 a.m., or who knows your mess and doesn’t run. Finding someone like that is luck. Continuing to choose each other through changes, distance, and hard conversations? That’s the blessing worth protecting.