Time and tide wait for no man. So the time indicated by the sunrise and the sunset will be uselessly wasted if such time is not properly utilized for realizing identification of spiritual values. Even a fraction of the duration of life wasted cannot be compensated by any amount of gold.

(Srimad-Bhagavatam 2.3.17 Purport)

That is advised by Rupa Gosvami. Avyartha kalatvam. Vyartha means spoiling. Avyartha means not spoiling. Avyartha kala. He should be always conscious that “I am not wasting my time.”

(Morning Walk — January 5, 1974, Los Angeles)