"Simple, direct and honest speech"
Truth is the cornerstone of trust and meaningful relationships. Quakers have always refused to swear oaths, because it implies that there are only certain occasions in which the truth matters. Early Quakers were known for their honesty and straight dealing. This is partly why Quakers were successful in business and banking in the 18th and 19th centuries.
Quakers aim to use simple, direct and honest speech. When we all use this 'plain speaking' we all know where we stand with each other. There should be no deception, no hidden agendas or important things left unsaid.
The Quaker quest for truth has an important role to play in wider society and political life. Quakers speak 'truth to power'. This means that when we feel that something important needs to be said, we must make the effort to say it to the people who need to hear it and have the power to effect change.