It is explained (Selections from Likkutei Sichos, Shmos, Parashat Tetzaveh, p. 483) that one of the principles of Torah study is to minimize the number of differences between the positions of the Sages. This can be found, according to the author, in the work "Sdei Chemed, vol. 10" and "Darchei Shalom, K'lallei HaShas, sec. 257".
I've been searching on HebrewBooks.org, but unfortunately could not find any of these works and in particular, these chapters describing these principles. Does anyone know where I can find these?
Also, the Rogatchover Gaon (Tzafnat Pa'neach) in his work the Michtevei Torah writes “Everything that is written in the Torah represents a law, not – Heaven forbid – a story.”. Does anybody know where I can find this letter online? Also on HebrewBooks.org, I was not able to find it.
Thank you very much in advance. Your help is much appreciated.