Repeated thoughts form grooves in your brain's web-like synapses (I only play a doctor to my daughter's scraped knees, so please forgive my non-scientific terms.) Each thought repeated digs that groove over and over again. When you think about being grateful over and over and over again, you become more grateful--it's easier to think "I am grateful for [blank]." Likewise, when you think "I am ugly/fat/stupid/lazy/lonely/sad/pathetic/loser/failure/dumbass/weakling/dirty/bad-mom/bad-wife/bad person--it's easier and easier to think that thought again and again.
I want to make gratitude a mental obligation in my head and in my house.
What was the best part of your day? To what/whom are you grateful?
You feel better now, just thinking about it, don't you?