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gmat阅读求助，哪位大侠能够帮忙翻译一下这篇文章的最后一段呢？没看懂 感谢！！

Some have asserted that human affairs are
             altogether determined by the voluntary action of men,
             some that the Providence of God directs us in every
             step, some that all events are fixed by Destiny. It is
(5)         for us to ascertain how far each of these affirmations
             is true.
                  The life of individual man is of a mixed nature. In
             part he submits to the free-will impulses of himself and
             others, in part he is under the inexorable dominion of
(10)       law. He insensibly changes his estimate of the relative
             power of each of these influences as he passes through
             successive stages. In the confidence of youth he
             imagines that very much is under his control, in the
             disappointment of old age very little. As time wears on,
(15)       and the delusions of early imagination vanish away, he
             learns to correct his sanguine views, and prescribes a
             narrower boundary for the things he expects to obtain.
             The realities of life undeceive  him at last, and there
             steals over the evening of his days an unwelcome
(20)       conviction of the vanity of human hopes. The things he
             has secured are not the things he expected. He sees that
             a Supreme Power has been using him for unknown ends,
             that he was brought into the world without his own
             knowledge and is departing from it against his own
(25)       will.
                  Whoever has made the physical and intellectual
             history of individual man his study will be prepared to
             admit in what a surprising manner it foreshadows social
             history. The equilibrium and movement of humanity are
(30)       altogether physiological phenomena. Yet not without
             hesitation may such an opinion be frankly avowed, since
             it is offensive to the pride, and to many of the
             prejudices and interests of our age. An author who has
             been disposed to devote many years to the labor of
(35)       illustrating this topic has need of the earnest support
             of all who prize the truth; and, considering the extent
             and profundity  of his subject, his work, at the best,
             must be very imperfect, requiring all the forbearance
             and even the generosity of criticism.