PREPOSITIONS. For == "as regards;" "because of," referring to the pastFor, from meaning "in front of," came naturally to mean "in behalf of," "for the sake of," "because of."
i.e. "because of certain friends." This use was much more common than with us. When we refer to the past we generally use "because of," reserving for for the future. Compare, on the other hand:
“Yet I must not (kill Banquo openly),
For certain friends that are both his and mine.
“He gave it out that he must depart for certain news.” N. P. 179.
“O be not proud, nor brag not of thy might,
For mastering her that foil'd the God of fight.
i.e. "no way can be compared for weakness with that," &c. "Of divers humours one must be chiefly predominant, but it is not with so full an advantage but, for the volubilitie and supplenes of the mind, the weaker may be occasion reobtaine the place again."--MONTAIGNE, 116. For is similarly used with an ellipse of "I lay a wager" in
“No way to that, for weakness, which she enter'd.
“Now, for my life, she's wandering to the Tower.