From The Collaborative International Dictionary of English v.0.48 [gcide]:
Usage: These particles are used, in certain connections, to assign the reason of a thing, or that "on account of" which it is or takes place. Because (by cause) is the strongest and most emphatic; as, I hid myself because I was afraid. For is not quite so strong; as, in Shakespeare, "I hate him, for he is a Christian." Since is less formal and more incidental than because; as, I will do it since you request me. It more commonly begins a sentence; as, Since your decision is made, I will say no more. As is still more incidental than since, and points to some existing fact by way of assigning a reason. Thus we say, as I knew him to be out of town, I did not call. Inasmuch as seems to carry with it a kind of qualification which does not belong to the rest. Thus, if we say, I am ready to accept your proposal, inasmuch as I believe it is the best you can offer, we mean, it is only with this understanding that we can accept it.
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