You can imagine thought to be an uncountable concept (singular), or you can imagine a thought as one of many possible countable concepts (plural). Neither is wrong grammatically. You are right to think that 'thought' in that context does give the impression of something more general and wider in sense, so that part of it is, I would say, if not as profound as a philosophical discussion, at least a matter of personal opinions.
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CliveSo, the consensus is that she should get her tattoo edited?Definitely. Months of painful laser treatments for the sake of grammar.