They call that a disease where the whole body is corrupted; they call that sickness where a disease is attended with a weakness, and that a defect where the parts of the body are not well compacted together; from whence it follows that the members are misshapen, crooked, and deformed.

So that these two, a disease and sickness, proceed from a violent concussion and perturbation of the health of the whole body; but a defect discovers itself even when the body is in perfect health.

But a disease of the mind is distinguishable only in thought from a sickness.

But a viciousness is a habit or affection discordant and inconsistent with itself through life.

Thus it happens that, in the one case, a disease and sickness may arise from a corruption of opinions; in the other case, the consequence may be inconstancy and inconsistency.