Warren Buffett believes in operating from his "Circle of Competence". It is not how big your circle is, but how well you define and operate within the perimeter.<br /><br />com·pe·tence   [kom-pi-tuhns] Show IPA<br />noun<br />1.<br />the quality of being competent; adequacy; possession of required skill, knowledge, qualification, or capacity: He hired her because of her competence as an accountant.<br />- dictionary.com<br />...<br /><a href="https://www.youtube.com/watch?v=P1q6vgFefjY" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=P1q6vgFefjY</a>