A sensation is the feeling of an external stimulus or an internal condition. - Will Durant

لقد قال فولتير إذا كنت ترغب في التحدث معي عرّف ما تقول وحدد قولك. كم من نقاش قد ينكمش ويتحول إلى مقطع لو تجرأ المتناقشون على تحديد عباراتهم وجملهم، هذا هو الأول والآخر في المنطق، وقلبه وروحه، بأن تخضع كل عبارة هامة في حديث جدي إلى أشد أنواع التعريف والتحديد والفحص. إنها طريقة صعبة، وامتحان لا رحمة فيه للعقل

The constant steaming in of thoughts of others must suppress and confine our own and indeed in the long run paralyze the power of thought… The inclination of most scholars is a kind of fuga vacui ( latin for vacuum suction )from the poverty of their own mind , which forcibly draws in the thoughts of others… It is dangerous to read about a subject before we have thought about it ourselves… When we read, another person thinks for us; merely repeat his mental process. So it comes about that if anybody spends almost the whole day in reading, he gradually loses the capacity for thinking. Experience of the world may be looked upon as a kind of text, to which reflection and knowledge form the commentary. Where there is a great deal of reflection and intellectual knowledge and very little experience , the result is like those books which have on each page two lines of text to forty lines of commentary

It is life that educates, and perhaps love more than anything else in life.