"Even of if a certain backlash is unavoidable, we must make the most of the momentous chance with which history has presented us so swiftly and so unexpectedly"

Moshe Sharett, a prominent Israeli leader and politician, presents a nuanced perspective with this quote. At its core, the quote speaks to the interplay in between opportunity and danger, particularly in the context of historical or political events. Sharett acknowledges the inevitability of reaction-- an unfavorable response or resistance-- as a typical effect when substantial modification is underway. This might stem from stakeholders who feel threatened by the shifts or from challenges posed by the transformation itself.

The phrase "a certain reaction is unavoidable" suggests realism and awareness on Sharett's part. It acknowledges that progress, particularly transformative development, often provokes resistance. This might be due to entrenched interests having a hard time to preserve the status quo or simply due to the pain and unpredictability that alter can bring. The word "certain" underscores the inevitability or expected nature of this resistance.

However, Sharett doesn't dwell on this negativity. Rather, he moves focus to an amazing sense of optimism and seriousness by highlighting the crucial to take "the memorable possibility with which history has presented us". This recommends that although backlash is expected, it needs to not deter action or trigger doubt. The chance to alter the course of history is uncommon and need to be focused on.

"Momentous possibility" describes a remarkable chance of excellent significance. History, according to Sharett, has set the stage for something remarkable-- one that shows up "swiftly and unexpectedly". This suggests that circumstances have lined up in such a way that needs immediate and definitive action, and there is little time for extreme care or delay. It's a call to accept the possible improvements while being completely aware of and prepared for the obstacles ahead.

In summary, Sharett's quote encapsulates a positive durability. It recognizes the intricacy and dual nature of substantial change: the inevitable obstacles it brings and the large, transformative capacity it holds. This state of mind encourages proactive engagement with historic opportunities, viewing them as gateways to extensive progress despite the probability of experiencing resistance.