The spirit relies upon feeling gratitude and appreciated. Every being's happiness is at the root fueled by feeling as though they contributed and that it was noticed by someone. As a fast paced society, we have all learned to supply the deficit of gratitude given from others and self-supplemented within ourselves a confidence and gratitude for ourselves.
What I have learned and am constantly learning is that feeling satisfied in yourself..by yourself is simply not enough. As Thank You's become more empty and robotic, standards get raised for what a good work looks like and progression numbs us from simple human interaction there is more need than ever to express gratitude for the people around you and the good things they do.
Are there people walking around your life that contribute to your day be it emotional, spiritual, relationship, friendship, career..simple day to day things to large things that make a difference for you but are going unappreciated? Are there simple yet heart felt "Thank You's" and "Great Job's" or even "I don't know how I would have done it without you. You make a difference." that you are in debt to people?
Be the change. Pay the gratitude debt you may owe today. You would be amazed at how much that could mean to someone to verbally hear how they are appreciated by you.