Without injustices,
the name of justice
would mean what?

...all that we do is governed by the law of opposites in which every so-called positive act is exactly and equally balanced by its opposite.;

Everything is balanced. Everything physical (matter/energy) goes back and forth in balanced circles, cycles, or the equivalent. Birth-death, old-young, big-small, strong-weak, start-stop, up-down, rich-poor, beginning-end, fast-slow, hot-cold, pain-pleasure, win-lose, day-night, full-empty, high-low, in-out, success-failure, united-divided, give-receive, creation-destruction, on-off, positive-negative, etc.

Positive and negative forces moving in balance are the physical universe.

Teddy thought of his wife and his sister as two sides of the same shining coin. Nancy was an idealist, Ursula a realist; Nancy an optimist with a lively heart, while Ursula’s spirit was freighted with the grief of history. Ursula was forever cast out of Eden and making the best of it while Nancy, cheerful and undaunted, was sure her search for the gate back into the garden would be successful.

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So you find yourself surrounded by death and horror in the world, and you escape it into lust. But lust has no duration; it leaves you again in the desert.