Let us be thankful for the fools. But for them the rest of us could not succeed.

The line is a sardonic epigram: it suggests that “success” is often relative and depends on comparison. If some people act foolishly, make poor choices, or set a low bar, others can appear wiser, more competent, or more deserving by contrast. Read this way, it critiques social and economic competition—implying that hierarchies and reputations are partly built on others’ mistakes rather than purely on merit. The mock-gratitude (“Let us be thankful”) heightens the irony, turning a moral posture into a cynical observation about how advantage is produced and recognized.