If you can understand the answer to this question, then you already have the best free thing. The best free thing is ‘understanding’ itself. Well, just that understanding is not a thing, and the best things in life are, as they say, not things.
Think of it. Many machines, many computers can read this answer that I am writing here. But only a human being can ‘understand’ this answer. A machine can mechanically analyze, or interpret this answer. A machine can even translate this answer to a hundred different languages. But no machine can ever ‘understand’ what I am saying. For that matter, no machine can ever ‘understand’ a verse from the Gita, or a common statement as ‘I love you’.
We get that gift free, right? Understanding. But since it comes free, many of us don’t value it and don’t live by it.