Life
Life is a mix of health, wealth and relationships. It is an equation and a function of these three. On the left hand side, is the only currency you have which is time. On the right hand side, you have things that you allocate your time to. Some of them gives you returns on the time you spend. For instance the time you spend on your health with help you have a longer lifespan. The time you spend on accumulating wealth, will help you buy other people's time (everything you buy, the services you take is all trading your money to buy other people's time).
Life = Health + Wealth + Relationship