The figure was so congruous with its surroundings that she saw with surprise a face totally strange to her.

There is little likelihood, too, of making them more congruous by any change in the sentence.

"No discipline is more suitable to man, or more congruous to the dignity of his nature, than that which refines his taste, and leads him to distinguish, in every subject, what is regular, what is orderly, what is suitable, and what is fit and proper.