a tiny brick seems to be unimportant but we should consider that, each one of those "insignificant" things make up the whole strong building.
If you don't mind a single tree then perhaps you consider a forest as something unimportant. But in your daily life, if you don't usually try to wash the dishes properly, or if you don't try to keep your home clean and in good order (or at least try to do your best) then, this quote is applicable as a good advise.
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