Now,I am studying accounting principles from kieso book but I dont understand what is the meaning of

... "Numberscold" in Harold Geneen quote
“To be good at your business, you have to know the numbers—
cold.”

And i want to understand this phrase also
One such company is Springfield
ReManufacturing Corporation (SRC).
When Jack Stack and 11 other
managers purchased SRC for 10 cents
a share,
it was a failing division of
International Harvester