In general,
What can we tell about other practises which are not mentioned in de Pali Canon? Can we be sure the Buddha would reject them, disprove of them? I think we must be careful to Judge.
The Budddha knew according sutta much more then he taught. For example, i am quit sure the Buddha must have been familiar with the subtle energetic body and energies which are described in a system of chakra’s, nadi’s, bindu’s etc.
I am quit sure the Buddha knew this from own experience too.
Some vajrayana techniques involve direct working on this level. I cannot imagine the Budddha did not knew these techniques. Would he reject such practises? And are we sure we must reject them as non-buddhist methods? Only because they are not mentioned in de Canon?
I belief, we cannot really say that only what is mentioned in the Canon has buddha’s approval.
Siebe