Do you agree with the hitch-hiker in The Magic Finger that "the secret of life is to become very very good at something that's very hard to do."

In the given quotation, the phrase "secret of life" is perhaps interchangeable with the phrase "key to a good life," or "best way to succeed in life." And in this sense, it does seem logical that to be successful in life, at least economically, it probably is important to be "very very good" at something that's "very hard to do." In theory, these are the types of people who are sought after, who are paid lots of money, and who perhaps even become famous.
For example, the very best Olympic athletes are "very very good" at running long distances, lifting heavy weights, diving in synchronicity, and so forth. The presidents that history remembers favorably are likewise people who are "very very good" at a job which is undoubtedly "very hard to do." Looking ahead into the future, the people that we need most are perhaps those "very very good" scientists who can discover the cure for cancer or who can find a solution to global warming.
With these examples in mind, I think I would agree with the hitch-hiker that, "the secret"—or at least one of the secrets—to life is to be "very very good" at something which is very hard to do." These are the people who will likely be economically successful, who may become famous or celebrated, and who, more importantly, will be needed to solve the biggest problems that the world has to contend with.