s the meaning of "非淡泊无以明志,非宁静无以致远"?

Whatisthemeaning

li kai zhe li hao teng dan shi, wo xi wang gen ni zai jian mian yi ci, ran hou jue ding gen ni yi qi zou hai shi yong yuan fang qi ni le! shen me jie guo de hua, qing yuan liang wo。 It is very sad for me to leave here。But,I hope meet you once again before my departure。 Only after then,can I dec...全部

  li kai zhe li hao teng dan shi, wo xi wang gen ni zai jian mian yi ci, ran hou jue ding gen ni yi qi zou hai shi yong yuan fang qi ni le! shen me jie guo de hua, qing yuan liang wo。
   It is very sad for me to leave here。But,I hope meet you once again before my departure。
  Only after then,can I decide to stay with you or leave you for ever!No matter what the decision is,please forgive me!。收起