“For every action, there is an equal and opposite reaction”, states Newton’s third law of motion. A little creative liberty shows us how it applies to several other aspects as well.
Everything we own ends up owning us, one bit at a time.
If the fulfillment of something we desire can make us happy, its absence will produce agony in equal measure.
As economists will tell you, any monetary purchase comes at the cost of foregoing a large basket of equally valuable alternatives. In other words, adding something to your life always takes something away. The same applies for time.