There's no earthly way of knowing
Which direction we are going
There's no knowing where we're rowing
Or which way the river's flowing
Is it raining?
Is it snowing?
Is a hurricane a-blowing?
Not a speck of light is showing
So the danger must be growing
Are the fires of hell a-glowing?
Is the grisly reaper mowing?
Yes! The danger must be growing
For the rowers keep on rowing
And they're certainly not showing
Any signs that they are slowing!
The Rowers - Roald Dahl (1959)
Rather a nice touch to slip it into Willy Wonka and the Chocolate Factory (1971) don't you think?