You will soon be seeing Madame du Châtelet. The friendship with which she honours me has not failed me in this pass. Her mind is worthy of you and her heart is worthy of her mind. The good offices she extends to her friends are as great as the keenness with which she learns languages and geometry, and when she has rendered us every imaginable service, she still thinks she has performed none; such is her intellect and her learning that she believes she knows nothing and has no idea how intelligent she is. Take her to your heart and let us be her admirers and friends as long as we live.