2.69 Ya nisa etc.  Infatuating is the Illusion which is night for all beings.  In that , the sage is awake (vigilant) with the thought  'How It could be avoided'  The stage where the worldly men keep awake i.e., perform multifarious  [worldly]  activities, that stage is the night for the sage, as he is ignorant regarding the worldly activities.
 
It amounts to this statement :  What is well-known as illusion, Its nature is indeed two-ford, viz., to delude and also to wear a deceptive appearance of spinning pleasure.  Of them (the two natures),  the worldly man, not considering Its former nautre, remains with a memory well teid to the second nature.  On the other hand, the man of Yoga, who is contrary to the other,  observes Its deluding nature in order to root It out.  Thus the man of perfect knowledge, while seeing  [properly],  pays no attention to Its nature of spinning pleasure.   His indifference to Its nature of spinning pleasure is due to the destruction of his false knowledge.  That stage is night to him, even while he sees.  Hence this is strange.  The man of Yoga is  awake (or understands)  in the field of wisdom, where everyone else is unconscious (or totally perplexed);  but in  [the field]  of ignorance he is not awake  (or does not understand),  where ordinary man is awake (or understands well).  This is also strange.
 That is why-