According to Osho, you can tell by the presence or absence of 'you.' When the Whole flows through, the personal 'I' disappears into vast emptiness; there’s no doer, no resistance, only the river. If you can feel yourself as a separate mover, you’re pushing upstream—opposing the Whole. Flow brings self-lessness; struggle reveals egoic separation.
If you still feel like a separate ‘me’ doing it, you’re fighting the current; when ‘me’ vanishes, life’s river is carrying you.