In Act IV, scene vii (p. 1090), Laertes says: “And so have I…

In Act IV, scene vii (p. 1090), Laertes says: “And so have I a noble father lost; a sister driven into desperate terms, whose worth, if praises may go back again, stood challenger on mount of all age for her perfections: but my revenge will come.” What does Laertes mean by these lines?