One cannot calculate the amount of loss there is in wasting valuable time. Either materially or spiritually, one should be very alert in utilizing the time which he has at his disposal.
Srimad Bhagavatam 2.7.15,
Srila Prabhupada
Many devotees spend half their time wishing for things they could have… If only they didn’t spend half of their time wishing.
Good times are the preparation for the hard/bad times.
History is a story of dead people, some good and some bad. However, everything is washed away by the waves of time.
How we utilize our time is what qualitatively makes human life great.
If one is very serious about making spiritual advancement, one must discipline his time.