Commentary for Nedarim 78:1
מתניתין קשיתיה מאי איריא דתני עומד אבל לא יושב שמע מינה דנכסי מבקר אסורין על החולה
Our Mishnah presents a difficulty to Samuel: Why particularly teach that he may stand but not sit? Hence it must refer to a case where the invalid is forbidden to benefit from his visitor.<span class="x" onmousemove="('comment',' It is certainly true that one who forbids his neighbour to benefit from him does not do so at the cost of his own health. But then he would draw no distinction between standing and sitting, and would desire the visitor to have the benefit of sitting in his house too. Hence on 'Ulla's interpretation the distinction in the Mishnah is wrong; therefore Samuel reverses it. ');"><sup>1</sup></span>
Ran on Nedarim
Seven items were created before the world was created -- meaning, that they entered the (God's) thought process to be created before the world was created, because the world can't stand without them. As it is stated elsewhere, that the thought of the people of Israel preceded all (in God's thoughts). And it is self-evident that the world was not created without there being a Gehinom for the wicked (an eventual place of judgement for their wickedness in this physical lifetime).
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