Every action has a consequence returning to you. For every cause there is an effect. For every effect can be traced back to a cause.
If you react to circumstances you may be unconscious in your reactions. If you respond to circumstances you may be conscious and deliberate in your responses. If you act consciously aware of the choices that you make, in every present moment of now, you can decide if that choice will bring happiness to you as well as for those around you affected by your choice.
By becoming a conscious maker of choices, the effect of your actions is to enable evolvement for you and for those around you affected by your choice. Ultimately, this evolution will be happiness for you and those affected by the cause and effect set into motion, by your conscious choice you made standing in your integrity.