If you keep on watching craving and aversion, at some point you’ll see that they arise from delusion. At that time, we just need to check if the mind is ruled by delusion or wisdom.
If there is wisdom – right view and right thought – then, meditation is happening. If there are wrong view and wrong thought, defilement overwhelms the mind.
That’s why you should check your thoughts. Yogis should remember the following:
If you’re doing it right (have right view and right thought), the practice cannot be wrong. If you’re doing it wrong (have wrong view and wrong thought), the practice cannot be right.