The principle and adoptive philosophy of adding value is one of the most powerful tools for you to keep on refining in your skills-set for life optimization. I'm well aware that every bit of advice being offered is somehow automatically branded with such terms as 'best' and 'most-powerful' and the lot, however for the idea of adding value let's take a closer look at how this single feature, once understood, honed and carefully practiced until it becomes an automatic habit, will indeed be your most powerful yet.
"The mind is everything. What you think you become."...Buddha
"He that fails to command his thoughts will soon lose command of his actions."
“Watch your thoughts, for they become words.
Watch your words, for they become actions.
Watch your actions, for they become habits.
Watch your habits, for they become character.
Watch your character, for it becomes your destiny."
If you really think about it you may notice that practically everything you do is as a result of some thought process that happened before the actual action takes place, with the exception of reflex actions, of course.