Karma

As a Buddhist, someone who believes in the law of cause and result, you should know that every time you feel discontent, every time you suffer, it is only because you have accumulated non virtue in the past. You have accumulated the cause and your suffering is the condition and result of what you yourself have done. There is no such thing as a fruit( or result) without a seed; nothing happens without a cause.

Gyatrul Rinpoche.