How much is too much?

As I start a new day, these questions keep whirling in my mind.

When do I say - "I give up.."?

How do I find out - "How much is too much?"

As every piece of my body aches and my strength threatens to break down any moment and every passing moment, I wonder if I can say 'yes' to the questions above. My Dad always tells me that fatigue is in our minds. We think that we're tired so we are. This is what I follow too. But, it seems now is the time when I am continuously stretching my limits and I won't know when I've crossed them to breakpoint.

I think body has its own way of showing it that this is the max I can go. Hope it does. :)