You Only Need to Know One Great All-Embracing Thing

You don’t have to know a lot of things for your life to make
a lasting difference in the world. But you do have to know the
few great things that matter, perhaps just one, and then be willing
to live for them and die for them. The people that make a
durable difference in the world are not the people who have
mastered many things, but who have been mastered by one
great thing. If you want your life to count, if you want the
ripple effect of the pebbles you drop to become waves that
reach the ends of the earth and roll on into eternity, you don’t
need to have a high IQ. You don’t have to have good looks or
riches or come from a fine family or a fine school. Instead you
have to know a few great, majestic, unchanging, obvious, simple,
glorious things—or one great all-embracing thing—and be
set on fire by them.

-- John Piper, Don't Waste Your Life

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