Quotes from the Secret Doctrine

The only decree of Karma – an eternal and immutable decree – is absolute Harmony in the world of matter as it is in the world of Spirit. 
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It is not, therefore, Karma that rewards or punishes, but it is we, who reward or punish ourselves according to whether we work with, through and along with nature, abiding by the laws on which that Harmony depends, or – break them. 
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Nor would the ways of Karma be inscrutable were men to work in union and harmony, instead of disunion and strife. 
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For our ignorance of those ways – which one portion of mankind calls the ways of Providence, dark and intricate; 
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While another sees in them the action of blind Fatalism.
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And a third, simple chance, with neither gods nor devils to guide them 
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Would surely disappear, if we would but attribute all these to their correct cause. 
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With right knowledge, or at any rate with a confident conviction that our neighbours will no more work to hurt us than we would think of harming them. 
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Two-thirds of the world’s evil would vanish into thin air. 
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Were no man to hurt his brother, Karma-Nemesis would have neither cause to work for nor weapons to act through.
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There is not an accident in our lives, not a misshapen day, or a misfortune, that could not be traced back to our own doings in this or in another life. 
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If one breaks the laws of Harmony, ... one must be prepared to fall into the chaos one has oneself produced. 
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Man is himself his own saviour as his own destroyer and need not accuse Heaven and the gods, Fates and Providence, of the apparent injustice that reigns in the midst of humanity.’ 
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SD 1:643-4
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The Law of KARMA is inextricably interwoven with that of Re-incarnation. 
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It is only the knowledge of the constant re-births of one and the same individuality throughout the life-cycle ... that can explain to us the mysterious problem of Good and Evil, and reconcile man to the terrible and apparent injustice of life. 
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The law of karma predestines nothing and no one. 
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It exists from and in Eternity, truly, for it is ETERNITY itself; and as such, since no act can be co-equal with eternity, it cannot be said to act, for it is ACTION itself. 
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It is not the wave which drowns a man, but the personal action of the wretch, who goes deliberately and places himself under the impersonal action of the laws that govern the Ocean’s motion. 
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Karma creates nothing, nor does it design. 
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It is man who plans and creates causes, and karmic law adjusts the effects; which adjustment is not an act, but universal harmony, tending ever to resume its original position, like a bough, which, bent down too forcibly, rebounds with corresponding vigour. 
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If it happen to dislocate the arm that tried to bend it out of its natural position, shall we say that it is the bough which broke our arm, or that our own folly has brought us to grief? 
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KARMA is an absolute and eternal law in the world of manifestation; ... for karma is one with the Unknowable, of which it is an aspect in its effects in the phenomenal world.’ 
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SD 2:303-6