A conception not reducible to the small change of daily experience is like a currency not exchangeable for articles of consumption; it is not a symbol, but a fraud.

Summary

This quote suggests that any belief or idea that cannot be applied or understood in practical terms is essentially worthless. Just like currency that cannot be exchanged for goods, a concept that is abstract and disconnected from everyday life is not meaningful or valid. It implies that a valuable notion should be clear, practical, and have tangible applications; otherwise, it is deceitful and lacks substance.