How can we use the theme of perseverance, in our current health crisis?

Although the account is in good standing at this point in time. is this sentence incomplete or complete?

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.

Lens quotation: "character is what you are in the dark." -dwight lyman moody