If you think of Krsna twenty-four hours, then you'll become fully Krsna conscious, and your life is successful. Don't allow anything. This requires little practice, abhyasa-yoga-yuktena cetasa nanya-gamina [Bg. 8.8]. I should not allow my mind to go, to think of any other subject than Krsna. Now we have got so many books. So whenever you find time… You must find time. There is so much time. So read all these books or chant. But when you are hungry, you take prasadam. When you are sleepy, take a snap. Not very much, just to refresh. And go on, either chanting the beads or reading the books or talking about Krsna. In this way, always remain in Krsna consciousness. Smartavyah satatam visnuh. Krsna consciousness means to remember Visnu always, twenty-four hours. Some way or other. Type for Krsna, write for Krsna, go outside for Krsna, sankirtana party, sell book for Krsna, bring money for Krsna, spend for Krsna. Krsna. That's all. Everything Krsna. This is Krsna consciousness.
From Srila Prabhupada's lecture on Srimad-Bhagavatam 2.3.14-15 — May 31, 1972, Los Angeles