They had to gather it, and eat it. And there was exactly what they needed for that day. Similarly faith that Jesus is God, the Bread of Life, does nothing for us till we gather and eat. Faith is something we do every day. We take our daily nourishment from him, and when we do that we are fed and strengthened for all we have to do.
Some people live their life in the past .
They hash over the mistakes of the past. They accept guilt for sins and failures which Jesus has long since forgotten. They talk about their regrets, and they bring up the awful things people did to them. But for Jesus the past is forgiven and forgotten. He is our God for today.