The Buddha was talking with Uttara, a young pupil of the bhramin Parasariya:
-Uttara, does Parasariya teach you how to develop your faculties?
-Yes, Master Gotama, he does teach us how to develop our faculties
-How does he do...
Looked at but cannot be seen - it is beneath form;
Listened to but cannot be heard - it is beneath sound;
Held but cannot be touched - it is beneath feeling;
These depthless things evade definition,
And blend into a single mystery.
In its rising there is no light,
In its falling there is no darkness,
A continuous thread beyond description,
Lining what can not occur;
Its form formless,
Its image nothing,
Its name silence;
Follow it, it has no back,
Meet it, it has no face.