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.
A. C. Bhaktivedanta Swami PrabhupadaIn the last stage of the spiritual master's life, the devotees of the spiritual master should take preaching activities into their own hands. In this way the spiritual master can sit down in a solitary place and render nirjana-bhajana.
A. C. Bhaktivedanta Swami PrabhupadaA grain of devotion is more valuable thank tons of faithlessness.
A. C. Bhaktivedanta Swami PrabhupadaAnyone who is steady in his determination for the advanced stage of spiritual realization and can equally tolerate the onslaughts of distress and happiness is certainly a person eligible for liberation.
A. C. Bhaktivedanta Swami PrabhupadaTo be nonviolent to human beings and to be a killer or enemy of the poor animals is Satan's philosophy. In this age there is always enmity against poor animals, and therefore the poor creatures are always anxious. The reaction of the poor animals is being forced on human society, and therefore there is always strain of cold or hot war between men, individually, collectively or nationally.
A. C. Bhaktivedanta Swami Prabhupada