We should chant the name of the Lord, Hare Krishna, that has as much potency as the Lord Himself.
Srimad Bhagavatam 3.21.32
The chanting of the holy name of Krishna expands the blissful ocean of transcendental life. It gives a cooling effect to everyone and enables one to taste full nectar at every step.
Sri Chaitanya Caritamrta,
Antya Lila, 20.12
By chanting Krishna's Holy Name, one cleanses all the dust from the mirror of one's consciousness.
The morning section of the day is the foundation for the rest of the day and is considered the best time for bhakti. A businessman earns maximum profit when he runs his business during this period. Our business, as devotees, is to chant Hare Krishna and to attain Lord’s maximum mercy, thus, we should chant in the morning.
One achieves bhakti [love of God] by hearing and chanting about the Supreme Lord's special qualities, even while engaged in the ordinary activities of life in this world.