Conservative Quaker Spirituality
For Isolated Friends
George Fox (1624-1691), Epistle 264, 1669
AND such Testimonies of Friends, as are deceased, let them be Recorded, that so the Testimony of the Lord through his Servants may not be lost, that he raised up his People, for the same they were carried on thro' great Tribulations and Sufferings; and many laid down their Lives, and had their Goods spoiled, and they persecuted to Death to keep up their Testimony (which the Lord moved them to speak by his Spirit) to future Generations: So that those Words, that they were moved to speak forth by the Power, may not be lost; that the Power and Spirit of the Lord may be exalted. . . . And so be Diligent, and those that can write, help them that cannot: This may be easily done.
(To Friends in New England, Virginia and Barbadoes)
DEAR Friends, Be faithful in the Power of the Lord God, in what you know, and then the Lord will preserve you; that you may answer the Witness of God in every Man, whether they are the Heathen, that do not profess Christ, or whether they are such as do profess Christ, that have the Form of Godliness, and be out of the Power. And keep your Meetings, you that know the Power of the Lord, and feel it, that in it you may have Unity ...
I am not Amish or Mennonite, but some people who come to my website are interested in knowing more about these groups. I can recommend these books as authoritative and relatively inexpensive sources of further information.