He had literally bought time for Judah with his heart toward God. That a single life lived before God could have such an impact is remarkable. The proud heart is too filled with it's own noise. God seldom speaks in that booming, sepulchral voice that we so easily picture. He is capable of it - but wants us to be quiet and listen.
Frightened children tend to be very quiet.
But they are often listening for signs of danger. When they hear the voice of their Mom or Dad speaking to them, they become calm and listen for more reassuring words. Their focus shifts from the perceived danger to the comfort and safety their parents provide for them. As adults, we can allow the business of life, and the din that goes with it, to crowd out that quiet voice. I often find out that God was either simply trying to slow me down, or He had something to impress upon me when I am home sick.