good luck

good : a. of a favorable character or tendency.  b. free from injury or disease.  c. agreeable, true, right, honorable, suitable, fit, and kind.

luck : a. the things that happen to a person because of chance.  b. the accidental way things happen without being planned.  c. a purposeless, unpredictable, and uncontrollable force that shapes events favorably or unfavorably for an individual, group, or cause.