Explain how one small act can have a large and far reaching effects

Many times we underestimate the small facts but they can change the course of our lives. If we think tragically for example a person who drives and is distracted for a moment, he bends down to look for something fallen (for example) he loses vision and is involved in an accident. This brings great economic and judicial complications.

If we want to give an example with a positive thinking we could think of a person who sees a lost animal and decides to rescue it. It's something quick, you think in an instant. When he gets home, he sees a television notice that the owner is looking for the pet and he gets in touch. The owner turns out to be someone very grateful who rewards the person economically (and it turns out that he is a student to whom the money helps him enormously)

We could give thousands of examples, positive and negative, of how our lives are going in relation to our decisions and our destiny.