Why is understanding causality so important? Causality is a self-regulating process to purify the minds of mankind. To change our attitude, or our way of thinking is difficult. How easy is it for an alcoholic to stop drinking? How easy is it to control our temper? Many times we understand our fallacies and promise to change; but when difficult situations arise, we succumb to our old ways. Just promising to change is not enough.
How do we become good people? We must understand causality. Good thoughts and behavior brings forth joy, and evil (greed, arrogance, and self love) brings forth inconveniences. Besides understanding causality, we must accept and ponder over the daily appearances of causality. When life brings upon difficulties, one must accept these inconveniences without malice, or resignation. It is only when we do this, can we bring forth a joyous future. The process of causality allows us to eventually eliminate our debts (bad effects of causality), and plant seeds that will blossom into joy (good effects of causality) only. This process purifies our mind. It eliminates greed, arrogance, and self love from our minds.
Whether one believes in God or not, the law of causality favors no religion, race, or country. Like the law of gravity, it applies to everyone. God has given us a process to purify our minds!