Having read this letter of yours, I felt you are more unusual than those who have seen udumbara flowers which are said to bloom once in three thousand years. I am so gratified, feeling that you are more unusual than a one-eyed tortoise that floats on the waves of the ocean once in 1,000 years to be able to find a hole to rest in a floating piece of sandalwood. Therefore, I am adding a few words of joy, hoping to help you gain rewards of your merit in this life; but I am afraid that my words might be like the clouds that cover the moon or the dust that tarnishes the mirror. I, nevertheless, value your questions so much that I cannot keep silent. Please consider my words as a drop of water in a great river or an ocean, or candlelight by the side of the sun or the moon.

Gassui Gasho, A Letter on Menstruation, Nyonin Gosho, Letters Addressed to Female Followers, Page 26-27