It's "think positive" as a standalone clause. The OED has consecrated this use of "think", for what that's worth, "frequently in slogans". The original saying was "think big", first seen in 1903.
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It's "think positive" as a standalone clause. The OED has consecrated this use of "think", for what that's worth, "frequently in slogans". The original saying was "think big", first seen in 1903. I explain it to myself as a copulative version of the verb "think". It's similar to "walk tall", but both "big" and "tall" have the advantage of already having been adverbs, something that can'