The quote is relevant in case of students. When students keep ignoring the books/delay to start their studies and as exam time approaches they fear for their results. They get demoralized after looking at the amount of syllabus to be covered and cry for the time they have wasted.
Then they keep cursing themselves/repent their approach, “If I had started earlier then this day would not have come.” In this process they lose the precious present time (which is willing to present them with golden opportunities in the near future) and jeopardize their future time also.
As a result students lose their upcoming exam attempt and cry foul at the system of ICAI. If they improve themselves instead of mourning at the previous attempt their next attempt is secured and they will do themselves a huge favour.
Today well lived makes every yesterday a dream of happiness and every tomorrow a vision of hope.