Paul Washer
The gospel is not merely an introductory message to Christianity--it is the message of Christianity, and the believer would do well to give his life in the pursuit of knowing its glory and making its glory known.

The purpose of our holy and righteous God was to save His church, but their sin could not go unpunished. It was, therefore, necessary that the punishment for that sin be transferred from those who deserved it but could not bear it, to one who did not deserve it but was able to bear it.
John Owen