One Modern-Day Adage About Time and Two Timeless Observations by Saints

When teaching students about time, a teacher employed the following quaint but quirky adage:

The past is history, the future is a mystery, today is a gift, that's why it's called the present. 

Innumerable saints have weighed in on the concept of time as well. St. Augustine's observation on the past, the present and the future, mimics said quotation above, but with profound insight into the nature God:

Trust the past to the Mercy of God, the present to His Love, and the future to His Providence.

— St. Augustine

St. Elizabeth Ann Seton, the first American saint, compared our earthly lives to our eternal existence. Any consideration of time, informed by Sacred Scripture, must acknowledge the fact that we will live forever. The only question is, Where?:

We must often draw the comparison between time and eternity. This is the remedy of all our troubles. How small will the present moment appear when we enter that great ocean. 

— St. Elizabeth Ann Seton