The Da Vinci Notebooks
Experience never errs; it is only your judgments that err by promising themselves effects such as are not caused by your experiments. Experience does not err; only your judgments err by expecting from her what is not in her power. Men wrongly complain of Experience; with great abuse they accuse her of leading them astray but they set
[paragraph continues] Experience aside, turning from it with complaints as to our ignorance causing us to be carried away by vain and…