I urge you to follow this path, not any other.
Just look at the traces of my wheel on the ground,
To ensure uniform warmth,
Do not rise or descend too soon towards sky or ground.
By rising too high, you'll be burnt by the sky,
By descending too low, the earth will destroy you.
And if your route remains in the middle
Your journey will be simpler and safer.

De Nuysement, Poème philosophic de la Vérité de la Phisique Mineralle in Traittez de L’Harmonie et Constitution generalle du Vray Sel.