Oswaldo Royett

 Now 90 years young, the Oracle of Omaha is still impressing with important life lessons. Ever read something Warren Buffett said or did and mumble to yourself, "Why didn't I think of that?" Outside of Buffett's mastery of investing, his down-to-earth wisdom is not only legendary but we all nod in agreement with the simple and yet profound effect it has on our lives. Take, for example, the advice below. Common sense, yes. But to many of us, it's not common practice. That is, until we become believers that the principles actually work. All you need to do is act on them with positive intent. 1. Pick your friends wisely. Buffett has taught so many lessons appealing to our common sense. One of them was recently highlighted in Bill Gates's memorable 90th-birthday message to his close friend: "Of all the things I've learned from Warren," said Gates, "the most important thing might be what friendship is all about. As Warren himself put it a few yea...