Here’s a useful illustration you’re welcome to.  Or perhaps just a funny story.

There was a family watching anxiously as floodwaters came up around their home. They had a great deal of faith, however, and trusted in God to save them. As the water came up into their yard, a 4-wheel drive truck pulled up to their house, and told them it was time to evacuate. “God will take of us,” was the father’s reply, and the truck moved on to help other families in that same neighborhood. As the waters came into the first floor, the family moved upstairs. A boat came up to one of their windows, and warned that the water would continue to rise. “God will provide,” was the only response the father would give, and finally the rescuers moved on to search for others in need. At last the family climbed onto the roof, and a helicopter tried to pick them up. After much argument with the reluctant family, the helicopter moved on as well. The flood water continued to rise, and all the family members drowned. As they stood before God, the man was confused and distressed. “I told all of those people that I trusted in you to save us. Why did you let us perish in the flood?” God replied “I sent you a truck, a boat, and a helicopter. What else did you want me to do?”

Even when opportunity knocks, we must open the door.