Sutta Pitaka
According to one discourse in the Samyutta Nikaya entitled "Bhikkhu Sutta" (SN 46.5):
- [Bhikkhu:] "Venerable sir, it is said, 'factors of enlightenment, factors of enlightenment.' In what sense are they called factors of enlightenment?"
- [Buddha:] "They lead to enlightenment, bhikkhu, therefore they are called factors of enlightenment...."[6]
During meditation, one may contemplate the seven Factors of Enlightenment as well as on their antithesis, the Five Hindrances (sensual pleasure, ill-will, sloth-torpor, restlessness-worry, doubt).[7] In addition, one Samyutta Nikaya sutta identifies developing each of the enlightenment factors accompanied by each of the four brahma viharas (loving kindness, compassion, sympathetic joy, equanimity).[8]
In the Samyutta Nikaya's "Fire Discourse," the Buddha identifies that mindfulness is "always useful" (sabbatthika); while, when one's mind is sluggish, one should develop the enlightenment factors of investigation, energy and joy; and, when one's mind is excited, one should develop the enlightenment factors of tranquility, concentration and equanimity.[9]
Again according to the Samyutta Nikaya, once when the Buddha was gravely ill he asked Venerable Mahacunda to recite the seven Factors of Enlightenment to him. In such a way the Buddha was cured of his illness.[10]