The highest summit of spiritual perfection is knowledge of the Supreme Personality of Godhead.
It is imperative that one approaches a spiritual master, for by such association one proportionately develops his consciousness towards the Supreme Personality of Godhead.
One must execute devotional service under the guidance of a devotee or directly under the guidance of the Supreme Personality of Godhead. It is not possible, however, to train oneself without guidance from the spiritual master.