Motyer:

“Here is a very largely forgotten and yet most vital principle. It is certainly the case that the church is called by God to safeguard, publicize and transmit His truth (e.g. 2 Tim 1:13, 14; 2:1, 2); but it is equally the case that the truth is the safeguard of the church, both in the corporate sense of preserving the whole body and in the individual sense of guarding, defending and keeping each member. The life which walks in the truth is impregnable”