Aïguttara Nikàya
1. Ekakanipàta

III. Akammanãya Vagga
Not manageable

21.Bhikkhus, I do not know of a thing so unmanageable as the undeveloped mind. The undeveloped mind is unmanageable. This is the first.

22. Bhikkhus, I do not know a thing so adaptable as the developed mind. The developed mind is adaptable This is the second.

23.Bhikkhus, I do not know a thing so detrimental as the undeveloped mind. The undeveloped mind is detrimental. This is the third.

24.Bhikkhus, I do not know a thing so harmless as the developed mind. The developed mind is harmless. This is the fourth.

25. Bhikkhus, I do not know a thing so detrimental as an undeveloped, secretive mind. The undeveloped secretive mind is detrimentalòhis is the fifth.

26. Bhikkhus, I do not know a thing so harmless as the developed manifest mind. The developed, manifest mind is harmlessòhis is the sixth.

27. Bhikkhus, I do not know a thing that is so detrimental as an undeveloped mind that has no practise. The not practising, undeveloped mind is very detrimentalòhis is the seventh.

28. Bhikkhus, I do not know a thing that is so harmless as a developed mind that makes much of it. The practising developed mind is harmlessòhis is the eighth.

29. Bhikkhus, I do not know a thing that brings unpleasantness as an undeveloped mind. The undeveloped mind brings unpleasantness. This is the nineth.

30.. Bhikkhus, I do not know a thing that brings pleasantness as a practising developed mind. The practising developed mind brings pleasantness. This is the tenth.