6. Time past cannot be called back again.
光陰一去不復返。
7. All time is no time when it is past.
光陰一去不復返。
8. No one can call back yesterday; Yesterday will not be called again.
昨日不復來。
9. Tomorrow comes never.
切莫依賴明天。
10.One today is worth two tomorrows.
一個今天勝似兩個明天。