Compassion according to Sikh ethics

[MisterrSingh]

The Sikh faith is renowned for its ideas and practices on tolerance and understanding. There have been  historical accounts where Sikh figures have exceeded all normal human limits on what is considered to be benevolent and tolerant behaviour. However, in the day-to-day reality of life for the average person (i.e. us), should there ever be limits imposed on how far we utilise these compassionate qualities, especially if the unbridled display and utilisation of such goodness will ultimately never be reciprocated, and, more importantly, will actually serve to cause more harm than discernible good in the long term? Or is the act of compassion itself the only concern, and any consequences -- either good or bad -- arising from its application are irrelevant; if so, why?