Friends:

The Doctrine of the Seven Links to Awakening is Unmatched!

Venerable Sariputta once told the Buddha :
Unsurpassable is how the Blessed Buddha has taught the supreme efforts imbedded
within the Seven Links to Awakening, that is:

1: The Awareness Link to Awakening: sati-sambojjhanga.
2: The Investigation Link to Awakening: dhammavicaya-sambojjhanga.
3: The Energy Link to Awakening: viriya-sambojjhanga.
4: The Joy Link to Awakening: pīti-sambojjhanga.
5: The Tranquillity Link to Awakening: passaddhi-sambojjhanga.
6: The Concentration Link to Awakening: samādhi-sambojjhanga.
7: The Equanimity Link to Awakening: upekkhā-sambojjhanga.

Venerable Sir, among all these supreme teachings & states, this also is unsurpassable!

On the 7 Links to Awakening (Sambojjhanga):
http://What-Buddha-Said.net/drops/III/The_Sun.htm
http://What-Buddha-Said.net/drops/III/The_Peak.htm
http://What-Buddha-Said.net/drops/III/The_Clothes.htm
http://What-Buddha-Said.net/drops/III/Rare_Emergence.htm
http://What-Buddha-Said.net/drops/III/Sequential_Seven.htm
http://What-Buddha-Said.net/drops/III/Vast_Penetration.htm
http://What-Buddha-Said.net/drops/III/The_Seven_Fruits.htm
http://What-Buddha-Said.net/drops/III/Unsurpassable_Seven.htm
http://What-Buddha-Said.net/drops/III/When_7_becomes_14.htm
http://What-Buddha-Said.net/drops/The_7_Links_to_Awakening.htm
http://What-Buddha-Said.net/drops/III/Leading_to_Enlightenment.htm
http://What-Buddha-Said.net/drops/III/The_Seven_Links_to_Awakening.htm
http://What-Buddha-Said.net/drops/III/The_Cause_of_Knowledge_and_Vision.htm
http://What-Buddha-Said.net/drops/III/The_Meaning_of_the-7_Links_to_Awakening.htm

Source (edited extract):
The Exhaustive Speeches of the Buddha. Dīgha Nikāya.
DN 28: Confirmed Conviction. Sampasādanīya Sutta.