। ॥ ६९ ॥
In plain words
Whatever it craves, the mind chases through the doors of the senses — and if it can't reach it, it aches, the way you ache over something of your own that has slipped away.
Close to the Sanskrit
Whatever object [the mind] has desired, it runs after through the doorway of the external senses; on failing to attain it, it grieves, just as [one grieves] when something of one's own has been lost.