I want you to think about the sourest lemon you've ever tasted. Like an actual lemon, not a metaphorical one. Now pick up that lemon and squeeze it. Watch the juice trickle out. Imagine sinking your teeth into it.
What kind of physical reaction are you having right now? Is your mouth watering? Did your lips pucker up? Science calls this a conditioned response. It's a physical reaction triggered by a mental stimulus.
Our lives are filled with conditioned responses like that. Each one of us has tons of reactions that, through repeated experiences, have become totally automatic. In yoga, we call these samskaras. They're like grooves in the brain and each time we have the same reaction, that groove gets deeper and deeper.
There are triggers you use that will affect your spirit surely as the thought of that lemon affected your body. Those triggers are WORDS!
Words (even the words you speak...