请大家帮忙翻译一下这几句英文谚语 急用 谢谢

请大家帮忙翻译一下这几句英文谚语 急用 谢谢i must be cruel only to be kindAfter climbing a great hill, one only finds there are many more hills to climbNow join hands yours heartsThere is nothing half so sweet in life as loves young dreamOne good turn deserves anotherA change is as good as a rest