Yes. Continuous means from some start to some end without break:
The water flowed continuously over the dam.
whereas continual means occurring repeatedly at intervals over a time span:
I continually lose at poker.
I should also mention that continual is often substituted for continuous, and would be correct in most contexts, however the converse is not generally true. That is to say,
The water flowed continually over the dam.
is okay, but you would (hopefully) not mean
I continuously lose at poker.
since that would imply that all you do all day long is play poker and lose.
A goal is a concrete eventuality you're trying to accomplish, while purpose implies a broader, more abstract teleological drive. The speaker is basically saying that crazy people may be trying to do something, they just aren't doing it for a reason. Which is ridiculous, but sounds portentous when you formulate it bombastically enough.
Best Answer
'null' is qualitative, representing the absence of quantity. Closer to the word 'void' than the number 'zero'. Example: he reduced it to nil.
'zero' is quantitative. Example: he got zero on his exam.