What is Peter's testimony regarding it?

Answer

"For we have not followed cunningly devised fables, when we made known unto you the power and
coming of our Lord Jesus Christ, but were eye-witnesses of His majesty!' 2 Peter 1:16.

By what other terms are these covenants designated?
What is the means through which this justifying grace is made available to the sinner?
What is sin declared to be?
To whom was this covenant-promise later renewed?
What relation does the earthly sanctuary sustain to the heavenly?
What is the foundation of faith?
How long will they reign?

Questions & Answers are from the book Bible Readings for the Home Circle