Not even Sir Alex Fergusons most fervent admirers can claim he has never made a mistake. But then what an enviable habit he has, as he pushes towards his 71st birthday with all of English football once again trailing in his wake.
The Ferguson trick is to so rarely make the same one twice.
It is a knack that can be described in various ways. Some might trace it back to the survival instincts acquired in the demanding streets of his native Glasgow. You might speak of that necessity to grow strong at broken places in a world which explores any sign of weakness day by relentless day. Perhaps more than anything it is a love of conflict, a passion to stay one step ahead because the alternative is to sink back into the crowd.
However you cut it, though, there is the recurring evidence of an ability to adapt successfully to even the most challenging circumstances and learn from those mishaps which linger most powerfully in the bones. His victory over Manchester City on Monday, with all the new possibilities of a psychological edge over rivals who so recently seemed to be an irresistible threat to an empire built over a quarter of a century, is surely one of the most compelling examples.
In almost every possible way it reflected Fergusons most enduring strength. Above all, it represented that capacity to see precisely where he had previously gone wrong. In this case he had to go back no further than a little more than seven months. It was the night of Monday, 30 April, when he took his team to the Etihad Stadium in a self-betraying frame of mind. It was marked by unprecedented caution, a dismaying refusal to rely on all the old certainties despite the fact that his 13th Premier League title was surely in the balance.