It always seems impossible until it's done.

We searched Mandela's published writings, speeches, and documented interviews — including *Long Walk to Freedom*, the Rivonia Trial transcripts, and Truth and Reconciliation Commission records — and found no primary source in which he wrote or spoke "It always seems impossible until it's done." The Nelson Mandela Foundation, the official custodian of his legacy and archives, addresses this line directly and reports that while it is popularly attributed to him, it has not been traced to his own writings or speeches. The phrase is ubiquitous in later motivational books — it appears credited to Mandela in James Smith's *How to Be Confident* (2022) and in Garth Callaghan's *Napkin Notes* (2014), and even titles a Petras collection — but these are all recent secondary uses that repeat the attribution without anchoring it to any datable Mandela source. We noted informal suggestions that the sentiment echoes older proverbs about perseverance, but we found no specific, citable earlier author or documented prior instance that would displace Mandela as the originator, so the bar for misattribution is not met. What we have, then, is a line broadly and consistently credited to Mandela, unconfirmed by any primary source, and without a competing origin we can name — the classic pattern of a beloved figure attracting an untraceable one-liner. This quote is attributed.