“Gratitude is the inward feeling of kindness received. Thankfulness is the natural impulse to express that feeling. Thanksgiving is the following of that impulse.”
Henry Van Dyke
And remember, you can feel any normal and understandable emotion and act in a rational and ethical way to whatever may occur moment to moment, but to rather rapidly integrate it positively and learn from it is a form of, and the process of attaining and expressing gratitude and thankfulness as well.