An antithesis

When we try to sink,
We float.
When we try to float,
We sink.

When we try too hard,
We often meet burnout.
When we calm down,
We re energize and excel.

When we hope too much,
We get tired
And give up.
When we accept what we have,
We get what we want.

What are we being told?
Is it to go with the flow and leave the rest to the almighty?
Or is it to give what we want the best of our efforts and just wait?