Additionally early Friends and modern Friends do not swear oaths, even in courtrooms (a choice that has been allowed in Britain since 1695, and is protected in the United States by the Constitution, and one that can be problematic elsewhere). When required, Quakers may instead "affirm" that they are going to tell the truth. This was considered an aspect of simplicity because it was simply telling the truth rather than embellishing it with an oath, which is not necessary if one is supposed to always tell the truth. It is also an aspect of the Testimony of Integrity. It comes in part from Christ's teaching in the sermon on the mount: