'my lance , my sword , and my good right arm stand ever at thy service , and , forasmuch as i am - as all the world doth know - the mightiest knight on life , i doubt not that the overthrow of these miscreant knights shall be but a light task , which i gladly undertake , and my skill and my prowess are such that , barring accident , i may confidently assure thee that their overthrow shall not do them permanent injury . '