Lincoln's position on the issue of slavery was known from his senatorial debates with Stephen Douglas in 1858. In one debate he said, "I believe this government cannot endure permanently half slave and half free." One of his most memorable quotes he stated, "A house divided against itself cannot stand." Even so, he was considered a moderate on the issue of slavery. He knew he could not end slavery in the south in one step. Instead he only spoke out against slavery in new American territories.