When we think big, it is contagious. But beware: When we, or others think small, the influence is that much more virulent.  As much as we influence others, so are we are at risk of catching others’ values and actions, of coming under their influence.  If we surround ourselves with small thinkers, we will think small.

We cannot change others, only ourselves. We can hope to influence them only by the integrity of our own behavior and actions. There’s so little time to waste. We must think big now.

— The Think Big Manifesto, Michael Port