As there is nobody but what will allow that there is a peculiar relation between Christ and his true disciples, by which they are in some sense in Scripture said to be one so I suppose there is nobody but what will allow, that there may be something that the true Christian does on his part, whereby he is active in coming into this relation or union; some uniting act, or that which is done towards this union or relation (or whatever any please to call it) on the Christian's part. Now faith I suppose to be this act.

Justification By Faith Alone (1738)