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.

What great truth therefore follows?
Why was it necessary for Christ to go away?
How long did he continue this work there?
Has the exact time of Christ's coming been revealed?
What else has He promised to do?
What is sometimes of greater value even than money to discouraged souls?
How did man lose his dominion?

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