The joy of life is living it and doing things of worth

The joy of life is living it and doing things of worth,
In making bright and fruitful the entire desert spots of earth.
In facing odds and mastering them and rising from defeat,
And making true what once was false, and what was bitter, make sweet.
For only you know perfect joy whose little bit of soil
Is richer ground than what it was when you began to toil.