Every second you spend thinking about what somebody else has is taking away from time that you could create something for yourself.

Gary Vaynerchuck

He who knows not and knows not that he knows not, but thinks that he knows, is a fool – leave him alone. He who knows not, and knows that he knows not, is a child – teach him. He who knows, but knows not he knows, is asleep – wake him. He who knows, and knows that he knows, and uses what he knows, is a leader – follow him. — Willie Jolley (paraphrasing a German proverb)

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