Great miracles and great changes do not always require the need for sound acts and events. More often than not, major changes are almost silent and unobserved. The fact that the results of them are deafening later does not mean that the intensity and the publicity were the same as the act from which they came from. The case of the treatment of congenital blind is typical.
A private conversation, a spitting on the ground, a blind man washed in a small water tank, are all silent acts and events, almost private. Few take part in the action, few actually speak, and few realize what is happening exactly. Many though, will try to understand later, to interpret and examine, judge and criticize or praise. In big events the real witnesses are few. We all want to be present and have an opinion in the results, even when we obviously have no true knowledge