How to remain always blissful

“As soon as one understands that everything that exists is under the powerful control of one’s most beloved friend, one comes to the stage in which the whole universe becomes a blissful abode (viśvaṁ pūrṇa-sukhāyate), because he sees Kṛṣṇa everywhere.”

and further down it says:

“If we see anything totally disconnected from the personal body of Kṛṣṇa, we may doubt whether Kṛṣṇa’s personality is actually the absolute source described in Vedānta-sūtra. As soon as one feels this way, he becomes fearful and should be understood to be under the control of the Lord’s illusory energy.”