Our duration of life is not very long, and there is no certainty of when we shall be ordered to leave everything for the next stage. Thus it is our duty to see that not a moment of our life is wasted in topics which are not related with Lord Krsna. Any topic, however pleasant, is not worth hearing if it is devoid of its relation to Krsna.
Srila Prabhupada, SB 1.16.6 ppt.