He Is The Wisest Philosopher Who

This remark appears alongside a closely related observation in The Life and Letters of Faraday (1870) by Henry Bence Jones: "All are sure in their days except the most wise." Together they form part of Faraday's consistent argument — also expressed in the 1819 lecture "On the Forms of Matter" — that scientific progress depends on holding theories provisionally. Faraday's own practice exemplified this: he repeatedly revised his understanding of electromagnetic induction as new experimental evidence emerged, and he famously said the philosopher should be "determined to judge for himself" rather than defer to authority.