Whoever knows Me as the Supreme Personality of Godhead, without doubting, is the knower of everything. He therefore engages himself in full devotional service to Me, 0 son of Bharata.
(Lord Sri Krsna Bhagavad-gita 15.19)
Those who fix their minds on My personal form and are always engaged in worshiping Me with great and transcendental faith are considered by Me to be most perfect.
(Lord Sri Krsna Bhagavad-gita 12.2)
After many births and deaths, he who is actually in knowledge surrenders unto Me, knowing Me to be the cause of all causes and all that is Such a great soul is very rare.
(Lord Sri Krsna Bhagavad-gita 7.19)