I alternate between sound (mantra) and form, and sometimes formless as well .
Ke to do concentrative meditation can be summed up in one line (taken from )
“Exert when relaxed and relax when exerted.”
As one walks the path, one invariably goes through these nine states of awareness: http://omswami.com/2015/02/nine-states-awareness.html
The rewards of concentrative meditation are huge. But most of them requires intense effort eventually .
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