法華経と申す経は転子病と申す病の様に候 - the sutra known as the Lotus in terms of a disease that is passed on to one's children.

本文
法華経と申す経は転子病と申す病の様に候、転子と申すは親の様なる子は少く候へども此の病は必ず伝わり候なり

弥源太入道殿御返事
［転子病御書］
（１２２８頁）
文永１１年９月
（１２７４年）

通解（意訳）
法華経という経は転子病という病のようなものである。転子というのは親の生き写しのような子という意味であり、実際の転子は少ないけれども、この法華経という転子病は、親の振舞いが子供へと、必ず生き写しのように伝わるのである。

English Gosho
 Let us discuss the sutra known as the Lotus in terms of a disease that is passed on to one's children.
 Concerning the disease that is passed on to one's children, though it may be rare for children to resemble their parents in every particular, this kind of disease will most certainly be passed on to them.

" A Disease Passed on to One’s Children "
"The Writings of Nichiren Daishonin", Vol.2, p. 497
September, 1274.
[ --- ] is liberal translation.

Interpretation (liberal translation)
 Passing called the Lotus Sutra is like the illness called "A disease that is passed on to one's children".
 "a disease that is passed on to one's children" is the meaning called the child like the living image of the parent.
 Actually, there are few such examples, however "a disease that is passed on to one's children" named this Lotus Sutra is infected so that the behavior of the parent is true to life of a child by all means.

参考文献：
「日蓮大聖人御書全集」
「御書をひもとく」
「英語で学ぶ御書」
第三文明社
Bibliography :
"The Writings of Nichiren Daishonin"
"The Record of The Orally Transmitted Teachings"