What did Christ say concerning secret prayer?

Answer

"But thou, when thou prays, enter into thy closet, and when thou has shut thy door, pray to thy Father
which is in secret; and thy Father which sees in secret shall reward thee openly." Matt. 6: 6.

In what event was this prophecy fulfilled?
What was the difference between Cain's and Abel's characters?
Why did God command Israel to hallow the Sabbath?
Under what authority were its decrees published?
What promise did God leave for these persecuted ones?
Why are we exhorted to patience?
What assurance has God given to believers?

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