Buddhists point out that we don’t know when karma will ripen and we will reap its fruit (or poison). Everything we do, no matter how small, has an effect. It’s easy to forget this because we often aren’t around for the results of our actions. Just as one small drop can make a ripple, our actions as individuals can have far-reaching effects.
So take care in what you do. You don’t know when the details will matter.