A pure devotee cannot forget the Supreme Lord for a moment, and similarly the Supreme Lord cannot forget His pure devotee for a moment. This is the great blessing of the Krishna conscious process of chanting the maha-mantra:
Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare,
Hare Rama, Hare Rama, Rama Rama, Hare Hare.
Bhagavad-gita 8.141,
Srila Prabhupada