The guy who does your daily deliveries.
The couple living across the hall with their 1-year-old.
The people you see often. Give them a kind word or two. Let them know they're appreciated and, more specifically, let them know you appreciate them.
Sometimes I am so focused on my own thoughts and feelings, I forget that there are others who are probably going through a tougher day. Maybe I don't notice because their smile is bigger than mine. If ever you ask yourself whether you should send someone a text, an email, a phone call; do it. Thinking about someone today? Let them know. I know that's what I'm going to do.