“(God) used that physical and mental and spiritual depletion to bring us to an end of ourselves and a place where we would have to depend on His strength instead of our own” -Greg Lucas:

Wrestling With An Angel from Brian Patton on Vimeo.

Yes, life is hard when you have a child with disabilities, but it is also very rewarding and a lesson in total abandonment.

See also:
The Beauty of Human Weakness
Your Handicapped Child is a Blessing