Nobody Unsderdtand It
'What I am going to tell you about is what we teach our physics students in the third or fourth year of graduate school... It is my task to convince you not to turn away because you don't understand it. You see my physics students don't understand it... That is because I don"t understand it. Nobody does.'
Feynman, Richard P. 
Other Links:
Old and New 
Fine Words and Insinuating Appearance 
The Same Thing 
Greatest Commandments 
The Balance 
Tenderness and Kindness 
The Essence of Man 
The Wise Person