There are several ways of saying the same thing, and different things resonate with different people. The one I like is this. Go out as far as you like. Some

There are several ways of saying the same thing, and different things resonate with different people. The one I like is this. Go out as far as you like. Somewhere out there ahead of you there are two primes p and q who differ by no more than 600. So there's a prime p with another prime q less than p+600. And now if you start from there and go still further, then you can do it again. No matter how far you will still find primes p and q with p<q<p+600. So there are infinitely many such pairs, because you can always find another one.