Devotee: Prabhupāda, what is the devotee's greatest enemy? A devotee's greatest enemy?

Prabhupāda: He, he himself. Because he's a rascal, he's his greatest enemy. So just get out of this rascaldom, and you become your friend. Nobody is enemy. You are yourself your enemy. 

(Morning walk-------Paris).

Paramahaṁsa: What would an example of unconscious falldown be?

Prabhupāda: Unconscious falldown, that... Suppose I am prone to... I was very much fond of smoking, but I have given up. So in a society there is smoking, so I become induced. He offers me cigarette, and unconsciously I smoke. Then I must repent, "Oh, what I have done?" That is excused. But if I secretly smoke and outwardly I show I am a devotee, then what is this? This is cheating.

(Morning walk-------Perth).

Pṛthu Putra: So when one has fallen too low in the material life, how can he come back to his original condition?

Prabhupāda: By surrendering to God, Kṛṣṇa.

(Room conversation-------Paris).

Hṛdayānanda: (break) (translating) After taking birth again, how does one continue his spiritual progress? They have two questions. And also when one is feeling very weak, fallen, how can he get going spiritually?

Prabhupāda: First of all, the next body may not be for cultivating knowledge in spiritual life because we are already fallen, and if we do not elevate, we may accept another body, still fallen. Therefore the intelligent person in this human form of life should take to spiritual cultivation of knowledge immediately. Immediately means before another death takes place. Because death will take place—that is certain—so our duty is immediately take to cultivation of spiritual knowledge so that we may get next life either liberation or another opportunity for cultivating spiritual knowledge. So anyone who begins cultivation of spiritual knowledge, he is on the path of perfection, but even if he falls down immaturely, he is guaranteed to get next life a human body so that he can again begin his cultivation of spiritual knowledge and make his life perfect. Therefore the conclusion is that without delay, we should immediately take to spiritual life and try to make our life perfect. Because there is no certainty when our death is coming. That is real intelligence.

(Lecture on Bhagavad-Gita--------Mexico).