Friends:

Exceptionally Rare is the arising of the Links to Awakening!

The Blessed Buddha once said:
Bhikkhus, these exquisitely refined & sophisticated Seven Links to Awakening do
never arise apart from the appearance of a Well-Come-Well-Gone One, an Arahat,
a Perfectly Self-Enlightened Buddha! They never emerge outside the discipline of
a thus Happy & Successful One! Which seven?

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.

These uniquely advanced, delicate & intricate Seven Factors of Awakening do never
emerge other than after the arrival of a Tathāgata, an Arahat, a Perfectly Self-
Enlightened Buddha! They never emerge outside the discipline of a Fortunate One!

Source (edited extract):
The Grouped Sayings of the Buddha. Samyutta Nikaya.
Book [V: 77] section 46: The Links. 9+10: Arising...