That is very true, we must take advantage of each day as if it were the last day of our lives ... there is a song that talks about that and I like it a lot ... We must appreciate every minute of our lives because we do not know when the day comes that we should leave this world, life is short and we should appreciate everything that God has given us, always seeing the good side of things and not waste time in seeing what we do not have.
This is the song to which I refer (but it's in Spanish)