Hegel has an idea he adapted from Goethe that the universe is one organic whole like a plant. Not just that each part is possible to figure out, but that all parts are part of one system. There can not be any part of truth that contradicts the other. This is similar to the method of Socrates who was able to find self contradictions in the opinions of others. He was thinking that once one gets to truth, contradictions will not be there.