(a) We know that "the hand of Jehovah" is with us because many people are becoming believers and getting baptized, and we can endure opposition and persecution with God's help.
(b) An example of Jehovah supporting His people is Brother Harald Abt, who endured imprisonment in a concentration camp during World War II. His wife, Elsa, also faced trials, but she experienced Jehovah's spirit providing her with calmness and strength during extreme adversity.