Don't waste your life in doubts and fears: spend yourself on the work before you, well assured that the right performance of this hour's duties will be the best preparation for the hours or ages that follow it.
1 a (1): a youth being trained for the medieval rank of knight and in the personal service of a knight (2): a youth attendant on a person of rank especially in the medieval period b: a boy serving as an honorary attendant at a formal function (as a wedding)