Foolish people are often reckless, attempting feats that the wise avoid. This saying is from “An Essay on Criticism,” by Alexander Pope.
fools rush in where angels fear to tread
Ignorant or inexperienced individuals get involved in situations that wiser persons would avoid, as in I've never heard this symphony and here I am conducting itoh well, fools rush in where angels fear to tread, or He tried to mediate their unending argumentfools rush in. This expression, so well known it is sometimes shortened as in the second example, is a quotation from Alexander Pope's Essay on Criticism (1709): "No place so sacred from such fops is barr'd ... Nay, fly to altars; there they'll talk you dead; For fools rush in where angels fear to tread."