From MN 26:
"I considered: âThis Dhamma that I have attained is profound, hard to see and hard to understand, peaceful and sublime, unattainable by mere reasoning, subtle, to be experienced by the wise. But this generation delights in attachment, takes delight in attachment, rejoices in attachment. It is hard for such a generation to see this truth, namely, specific conditionality, dependent origination. And it is hard to see this truth, namely, the stilling of all formations, the relinquishing of all acquisitions, the destruction of craving, dispassion, cessation, NibbÄna. If I were to teach the Dhamma, others would not understand me, and that would be wearying and troublesome for me.â Thereupon there came to me spontaneously these stanzas never heard before:
âEnough with teaching the Dhamma
That even I found hard to reach;
For it will never be perceived
By those who live in lust and hate.
Those dyed in lust, wrapped in darkness
Will never discern this abstruse Dhamma
Which goes against the worldly stream,
Subtle, deep, and difficult to see.â
Considering thus, my mind inclined to inaction rather than to teaching the Dhamma.
From DN 15:
Mentality-Materiality
âIt was said: âWith consciousness as condition there is mentality-materiality.â
How that is so, Änanda, should be understood in this way: If consciousness were not to descend into the motherâs womb, would mentality-materiality take shape in the womb?â
âCertainly not, venerable sir.â
âIf, after descending into the womb, consciousness were to depart, would mentality-materiality be generated into this present state of being?â
âCertainly not, venerable sir.â
âIf the consciousness of a young boy or girl were to be cut off, would mentality-materiality grow up, develop, and reach maturity?â
âCertainly not, venerable sir.â
âTherefore, Änanda, this is the cause, source, origin, and condition for mentality-materiality, namely, consciousness.
Consciousness
âIt was said: âWith mentality-materiality as condition there is consciousness.â How that is so, Änanda, should be understood in this way: If consciousness were not to gain a footing in mentality-materiality, would an origination of the mass of sufferingâof future birth, aging, and deathâbe discerned?â
âCertainly not, venerable sir.â
âTherefore, Änanda, this is the cause, source, origin, and condition for consciousness, namely, mentality-materiality.
âIt is to this extent, Änanda, that one can be born, age, and die, pass away and re-arise, to this extent that there is a pathway for designation, to this extent that there is a pathway for language, to this extent that there is a pathway for description, to this extent that there is a sphere for wisdom, to this extent that the round turns for describing this state of being, that is, when there is mentality-materiality together with consciousness.