Cause and effect may sound very simple, but when examined on a deeper level, it is difficult to explain precisely how causation functions.
It is like, for example, a small child who pointing at the sky and being unable to fully comprehend its expanse. Thus, it is important for us to be cautious in every act we undertake, whether large or small, and most importantly we should avoid non-virtuous actions and practice virtuous actions, which are the source of happiness, good health, and progress on the spiritual path.