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If you can dream – and not make dreams your
master;

If you can think – and not make thoughts your
aim;

If you can meet with Triumph and Disaster

And treat those two impostors just the same

—“If,”
Rudyard Kipling

Why is the repetition in the first two lines effective?

It warns the reader about the dangers of dreaming and thinking.
It makes the poem longer.
It adds rhyme to the poem.
It stresses the importance of dreaming and thinking carefully.