Perseverance!!!

Perseverance
/pəːsɪˈvɪər(ə)ns/
noun
            persistence in doing something despite difficulty or delay in achieving success

Read the following snippet from ADULTERY (Paulo Coelho) few weeks back:

A rose dreams of enjoying the company of bees, but none appears. The sun asks:
“Aren’t you tired of waiting?”
“Yes,” answers the rose, “but if I close my petals, I will wither and die.”

Yes, perseverance… sustaining life!!!