This thread is for linking to the most profound suttas in the Pali Canon.  

I'll start with the Bahiya sutta.  

Here it is in two different translations: 

http://www.accesstoinsight.org/tipitaka/kn/ud/ud.1.10.than.html

http://www.accesstoinsight.org/tipitaka/kn/ud/ud.1.10.irel.html

Upatissa (later called Sariputta) meets Assaji, pesters him ("speak a little or a lot, but tell me just the gist"), gets pointing-out instructions, enters the stream. Upatissa's Question.

I enjoy the Maha-dukkhakkhandha Sutta: The Great Mass of Stress:
http://www.accesstoinsight.org/tipitaka/mn/mn.013.than.html
The buddha speaks of the allure, the drawback and the escape of sensuality, form and feeling.

Chachakka Sutta   Majjhima Nikaya #148

This , to me is profound, due to the Sutta's history of bringing "Sudden Awakenings" upon being heard out loud and understood.  Buddha the Direct Pointer.


http://talks.dhammasukha.org/uploads/1/2/8/6/12865490/mn-148-dsmc-bt-110825.pdf

Edit adding one more, 

Sammaditthi Sutta  MN-9 Right View  Profound , shows full path to cessation

http://talks.dhammasukha.org/uploads/1/2/8/6/12865490/mn-009-010824.pdf

Psi Phi

One of my favorite recent ones:

http://dharmafarer.org/wordpress/wp-content/uploads/2009/12/1.4-Udumbarika-Sihanada-S-d25-piya-proto.pdf

In this sutta the Buddha gives a challenge to a group of outsider wanderers claiming that it would take them a maximum of 7 days to complete his challenge (arahatship). In the end none of the wanderers accept the challenge as they are overcome by Mara.

The peculiar part of this sutta is that the Buddha claims that it is not necessary for any of them to give up:

-Their notions of wholesome and unwholesome.
-Their current teacher.
-Their livelihood.
-Their training.

The specific wonderful passage may be found here:




And as a bonus, here is some conversion magick for you!

http://dharmafarer.org/wordpress/wp-content/uploads/2013/04/45.8-Licchavi-Bhaddiya-S-a4.193-piya.pdf

I have a liking for the Malunkyaputta Sutta of the Samyutta-Nikaya. It is my favourite insight instructions. It has the Bahiya passage in it ("in the seen, let there only be the seeing", etc) followed by a commentary/explanation of its meaning by Malunkyaputta, which is then approved by the Buddha. I prefer Bhikkhu Bodhi's translation of that sutta.

howdy,
a "new" translation of one of the more 'profound' suttas.

http://plumvillage.org/news/thich-nhat-hanh-new-heart-sutra-translation/