Explain the following lines from King Lear Rive your concealing continents and cry These dreadful summoners grace. I am a man More sinn’d against than sinning.

Lear is not doing too well when he says this. Everything has gone downhill for him. The guy has no friends and he is wandering around a heath in the middle of a thunderstorm. Lear tries to drown out the thunder with his declaration of the world's sins against him.