Is it all you need?

I walk past this wall most days, and my reaction to it changes almost everyday depending on my mood. I have days when it makes me smile and think how its very true, but I also have days when all I can think is that it most certainly isn't. I should point out here that these changes in attitude are almost never to do with himself, almost. Quite often my more pessimistic days are due simply to the fact that I'm running late.