If there is only one skill you could master, then make it how to keep yourself happy regardless of what’s going on around you. Contentment is the mother of happiness. But, if you can’t feel contented for any reason, then devote yourself to a purpose or a cause that gives you a sense of fulfillment. If you don’t have a purpose, then find one. It’ll be worth every effort. Take my word for it. Above all, happiness is not a blessing, it is a skill. It is not something we are born with, it is something we learn.

