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Ofc we dont need to Imagine anything but we constantly do so. Everything we perceive with our senses is kind of imagination, its just a filtered projection of what can be called reality. But my intention when i reduced "most powerfull force" to "most powerfull force we can imagine" was to show that we shouldn´t think absoulutly and in superlatives. We should always leave space for something bigger, better or more powerful. But thats just my opinion. Thank you for your interest btw =D