समाधौ क्रियमाणे तु विघ्नान्यायान्ति वै बलात् ।अनुसन्धानराहित्यमालस्यं भोगलालसम् ॥ १२७ ॥
In plain words
But the moment samādhi is actually being practised, the obstacles arrive — and they arrive with force: the thread of attention drops, laziness sets in, the craving for pleasure starts up again.
Close to the Sanskrit
But when samādhi is being practised, obstacles indeed come forcibly: absence of sustained attention, laziness, craving for enjoyment.