When you undergo suffering, don't complain. Instead, be grateful for the suffering, because only those who go through the furnace of life are His special children.
Fate, Universe, God, or as I prefer to call it "neeli chhatri wale uncle," likes to leave some people "alone;" indeed, they are His special needs kids, (so to speak!) and so He personally takes care of them in His own miraculous ways. Some miracles are a mouthful of sweetness and others end up giving an unexpectedly sweet aftertaste.