There are only two choices in life: buy assets or buy liabilities.

Don't buy liabilities; learn to buy assets. The same applies to time. Learn to invest in time assets, not time liabilities. When you buy time assets, you become more and more free; when you buy time liabilities, you become increasingly out of control.

Every time a desire arises, you'd best think about whether it's truly an asset or a liability when measured on the timeline of your life.