Past performance is no guarantee of future results.
It’s a standard disclaimer in the financial-management business, but I didn’t know until just now that it’s a Rule.
SEC Rule 156 requires mutual funds to tell investors
not to base their expectations of future results
on past performance before they invest. – Forbes
Of course, the Rule applies to many things beyond investments: cooking (especially if one is, ahem, inclined to the casual with respect to recipe adherence), birdwatching, and any artistic endeavour.