No matter what, the moment that you miss will never come back. In all your years here on this planet, if you can recall only a few moments of your Life as memorable, then the truth is that you probably lived ONLY in those moments. All the other time, you may have merely been existing.
A minister asked Takuan, a Zen teacher, to suggest how he might pass the time. He felt his days very long attending his office and sitting stiffly to receive the homage of others.
Takuan wrote eight Chinese characters and gave them to the man:
Not twice this day
Inch time foot gem.
This day will not come again.
Each minute is worth a priceless gem.