That whose existence is necessary must necessarily be one essence.

Leeches should be kept a day before applying them. They should be squeezed to make them eject the contents of their stomachs.

An ignorant doctor is the aide-de-camp of death.

Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.

Is it the fault of wine if a fool drinks it and goes stumbling into darkness?

God, the supreme being, is neither circumscribed by space, nor touched by time; he cannot be found in a particular direction, and his essence cannot change. The secret conversation is thus entirely spiritual; it is a direct encounter between God and the soul, abstracted from all material constraints.

The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.