To accuse others for one's own misfortunes is a sign of want of education. To accuse oneself shows that one's education has begun. To accuse neither oneself nor others shows that one's education is complete.
为自己的不幸而指责别人是缺乏教育的表现。指责自己表明自己的教育已经开始。既不指责自己，也不指责别人，说明一个人的教育已经完成。