And for a sure ground of our true calcination,
Work wisely only kind with kind.
For kind to kind has appetite and inclination.
He who does not know this, in knowledge is blind,
And may wander forth as mist in the wind,
Knowing never with profit where to alight,
Because he conceives not our words aright.

Join kind to kind therefore as reason is,
For as every young shoot answers its own seed,
Man begets man, a beast a beast, likewise,
Further to treat of this there is no need.
But understand this point if you will succeed,
Each thing is first calcined in its own kind,
This well concealed fruit therein shall you find.

Twelve Gates (First Gate), Ripley