Concerning what did Christ tell us not to marvel?

Answer

"Marvel not at this: for the hour is coming, in the which all that are in the graves shall hear His voice, and
shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto
the resurrection of damnation." John 5: 28, 29.

How did Christ make it clear to them that the Scriptures testify of Him?
Is there a limit to the strivings of God's Spirit?
Whose Spirit inspired their utterances?
Who has the promise of being blessed in his doing?
For how long a time was the seventh-day Sabbath observed in the Christian church?
Was there anything made without Christ?
How perfect would God have us become?

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