James 2:20

But wilt thou know, O vain man, that faith without works is dead? — “Vain,” i.e., empty and useless. Some copies have a word which means idle, fruitless, workless, in place of that translated “dead”; but the sense is the same either way. “If,” says Bishop Beveridge, “I see fruit growing upon a tree, I know what tree it is upon which such fruit grows. And so, if I saw how a man lives, I know how he believes. If his faith be good, his works cannot but be good too; and if his works be bad, his faith cannot but be bad too: for, wheresoever there is a justifying faith, there are also good works; and wheresoever there are no good works, there is no justifying faith.” Works are the natural fruit of faith; and without them it is evident the tree is dead, perhaps at the very roots, ready to be cut down and cast into the fire.