Alice laughed. “There’s no use trying,” she said: “one ca’n’t believe impossible things.” “I dare say you haven’t had much practice,” said the Queen. “When I was your age, I always did it for half-an-hour a day. Why, sometimes, I’ve believed as many as six impossible things before breakfast.” (from Through the Looking Glass and What Alice Found There by Lewis Carroll)
I guess you never really know what you’re capable of until you try.