J. Gresham Machen

"That Church is still alive; an unbroken spiritual descent connects us with those whom Jesus commissioned. Times have changed in many respects, new problems must be faced and new difficulties overcome, but the same message must still be proclaimed to a lost world. Today we have need of all our faith; unbelief and error have perplexed us sore; strife and hatred have set the world aflame. There is only one hope, but that hope is sure. God has never deserted his church; his promise never fails. (J. Gresham Machen, 386)" 

https://www.desiringgod.org/articles/he-took-up-arms-against-liberalism