In my attempts to read more, I spent a lot of time recently learning about the Stoic ethics.
To sum it up, the Stoics claim there are four key virtues that a person should strive to in order to be happy: wisdom, justice, courage, and moderation. (If you're keen to learn more, there's a great article here.)
I try to pay attention to all the little things I do throughout the day and compare it with these virtues.
Do I react impulsively when someone points out a mistake I made? Am I being selfish when I'm choosing a restaurant for a family lunch based on my food preference? Do I have a reasonable right to ask for a salary increment or am I just being greedy? Am I being resourceful when I schedule meetings at work or am I wasting my colleagues' time? Am I telling my honest opinion when my friend asks for an advice? Do I treat the cleaner in the local gym with the same level of kindness as my dear ones? Am I staying away from gossip, grumpiness and procrastination?
By shaping my thoughts I shape my actions. I approach every new task with confidence instead of fear of failure. I plan it out and I ask for help when I don't have the capacity to finish it by myself. I can breathe far easier. And I'm happy.