Cora Diamond- Throwing Away the Ladder

Cora Diamond- "Throwing Away the Ladder: How to Read the Tractatus"

6.53 To say nothing except what can be said....

6.54. He must so to speak throw away the ladder, after he has climbed up on it.

7. Whereof one cannot speak, thereof one must be slient.

There is an useful link:

http://www.hum.utah.edu/philosophy/Faculty/millgram/witt/wittrdngs.html