During the Sinai Campaign, the previous Belzer Rebbe, who was well known for his holiness and piety, stood for two full days in prayer.
He was not suspected of being a Zionist, nor did he suddenly become one.
But this was a time of great crisis in the world, and there are times when a person changes his mind in response to a crisis, even if not by dramatic declarations.
The hope is that, beyond a certain point, a person can no longer truly claim that a momentous event was a chance occurrence, and he will then understand that he requires rectification and that he must examine his deeds.
–Rabbi Adin Steinsaltz