我思，故我在。－笛卡兒
因為我是一個生活在聽不見聲音又看不到色彩的世界裏的人，所以我對這世界的體驗有限。但自從我讀了書後，我有了一個樂觀的想法，即是我生理上的缺陷並非生命中最主要部份，因為這些缺陷一點也不曾影響到我心智的健全。這種信念在我念了笛卡兒的格言「我思，故我在」，兒更趨堅定。
這五個有力的字使我驚覺，不再迷茫，我知道用我的心智可以培養一種積極的樂趣，以悠然自得的樂觀態度，度過黑暗及寂靜無聲的生活。我學到了不管外界有那些災禍降臨到我們頭上，我們仍有可能在內心創造光明，以及和諧的聲音和事物的秩序。
海倫 凱勒（盲啞教育家及演說家）
On Thinking
“I think,therefore I am.” －DESCARTES
Mine has been thelimited experience of one who lives in a world without color and without sound.But ever since my student days I have had a joyous certainty that my physicalhandicaps were not an essential part of my being, since they were not in anyway a part of my mind. This faith was confirmed when I came to Descartes’maxim,“I think, therefore I am.”
Those fiveemphatic words waked something in me that has never slept since. I knew thenthat my mind could be a positive instrument of happiness, bridging over thedark, silent void with concepts of a vibrant, light-flooded happiness. I learnedthat it is possible for us to create light and sound and order within us, nomatter what calamity may befall us in the outer world.
HELEN KELLER –DEAF AND BLIND AUTHOR AND LECTURER
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