If she does not know the answer to a question, she guesses with mischievous assurance.

Though very far from being hampered by any dogmatic philosophical or religious system of the past, his mind, until near the end, found sufficient satisfaction in the Christian view of life to make it indifferent to the restless, inquiring spirit of the present, and disinclined to play with any more recent solution of life's problems. He had no sympathy with either scepticism or formal dogmatism, and no need to hazard rash guesses respecting man's destiny.

Actually, I could make guesses, but they might well be spectacularly wrong and a guy doesn't want that haunting him ten years from now.

The identification of them with the jewels of the breastplate and on the shoulders of the high priest (which apparently has the authority of Josephus) is unwarranted; other ancient guesses are equally baseless.

In 1827 Guesses at Truth by Two Brothers' appeared.