The happiest, most fulfilled and successful people in this world know themselves inside and out. They know their strengths as well as weaknesses - playing into their strengths and ensuring their weaknesses don’t get in the way of their goals.
But the first step they took before embarking on their goals be it getting healthier, wealthier, happier or just to be a little more satisfied in their lives, was to equip themselves with the knowledge of their true selves.