Life is a series of moments and moments are always changing, just like thoughts, negative and positive. And though it may be human nature to dwell, like many natural things it's senseless, senseless to allow a single thought to inhabit a mind because thoughts are like guests or fair-weather friends. As soon as they arrive, they can leave, and even the ones that take a long time to emerge fully can disappear in an instant. Moments are precious; sometimes they linger and other times they're fleeting, and yet so much could be done in them; you could change a mind, you could save a life and you could even fall in love.