not ignorance, but the ignorance of ignorance, is the death of knowledge.---whitehead
布置无知本身，而是对无知的无知，才是知识的死亡。--怀特海德
Don't part with your illusions. When they are gone you may still exist, but you have ceased to live. (Mark Twain, American writer)
不要放弃你的梦想。当梦想没有了以后，你还可以生存，但是你虽生犹死。（(美国作家 马克·吐温)
Ideal is the beacon. Without ideal, there is no secure direction; without direction, there is no life.( Leo Tolstoy, Russian writer)
理想是指路明灯。没有理想，就没有坚定的方向；没有方向，就没有生活。(俄国作家 托尔斯泰. L.)
The ideals which have lighted my way, and time after time have given me new courage to face life cheerfully 19 have been kindness, beauty and truth.(Albert Einstein, American scientist)
有些理想曾为我们引过道路，并不断给我新的勇气以欣然面对人生，那些理想就是--真、善、美。 (美国科学家 爱因斯坦. A.)
The only limit to our realization of tomorrow will be our doubts of today. (Franklin Roosevelt, American president)
实现明天理想的唯一障碍是今天的疑虑。(美国总统 罗斯福. F.)
Hope is a good breakfast, but it is a bad supper.
希望是顿美好的早餐，但却是顿糟糕的晚餐。——Francis Bacon
My hopes are not always realized, but I always hope.
并不是我的所有愿望都能实现，但我依然拥有希望。——Ovid
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