I think the quote is attributed to Saint Ireanaeus from about 19 centuries ago. We must grow to be our best selves and become balanced and whole, joyful and serene. We are are to aspire to become Saints. Holy!. To grow in virtue and use the gifts of the Holy Spirit and to be of service all for the glory of God. I strive to live each day. Loving my neighbor keeps me fully alive most of the time.It is a test,challenge and a struggle that makes each day another chance to get it right
That is how I see being fully alive:
Do as you see fit.Do what you can with what you are blessed with and you grow.
Get busy living .It is good practice for eternal life.