"Purpose is the opposite of chance ("hasard" in french). Humans (and animals) do things on purpose, but not nature. It is a matter of understanding what causes and consequences are, then there's less room for purpose (actually, there should be none)."

Purpose indicates a desire or will to do something.

pur·pose
n.
1. The object toward which one strives or for which something exists; an aim or a goal: "And ever those, who would enjoyment gain/Must find it in the purpose they pursue" Sarah Josepha Hale.
2. A result or effect that is intended or desired; an intention. See Synonyms at intention.
3. Determination; resolution: He was a man of purpose.
4. The matter at hand; the point at issue.
http://www.thefreedictionary.com/purpose

I think I side with Tom, something seems to be lost in translation.

Someone in a state of apathy would lack will and desire:

"Apathy can be defined as an absence or suppression of emotion, feeling, concern or passion. Further, apathy is an indifference to things generally found to be exciting or moving.
Description:
A strong connection exists between apathy and mental disorders. Apathy is one of the hallmark symptoms of schizophrenia. Many people with schizophrenia express little interest in the events surrounding them. Apathy can also occur in depression and depressive disorders. For example, people who are depressed and have major depressive disorder or dysthymic disorder often feel numb to events occurring around them, and do not derive pleasure from experiences that they once found enjoyable."
...
"All people may experience periods of apathy. Disappointment and dejection are elements of life, and apathy is a normal way for humans to cope with such stresses— to be able to "shrug off" disappointments enables people to move forward and try other activities and achieve new goals. When the stresses pass, the apparent apathy also disappears. A period of apathy can also be viewed as a normal and transient phase through which many adolescents pass.

It is important to note, however, that long-term apathy and detachment are not normal."
http://www.minddisorders.com/A-Br/Apathy.html