"You can only do so much grunting and groaning and then you're done, you know?"

This quote by Craig T. Nelson is a pointer that there are limitations to what we can do. We can just do so much prior to we reach our limitation and need to stop. It is a tip to not overexert ourselves and to be mindful of our own capabilities. It is likewise a tip to not take on too much and to be reasonable about what we can accomplish. It is important to acknowledge when we have done all that we can and to not push ourselves too hard. We should be aware of our own limitations and look after ourselves. This quote is a tip to be conscious of our own abilities and to not overexert ourselves.