I can’t answer if you do not show the excerpt please
The diary provides a vivid and poignant glimpse into the world of a young Jewish girl living in Nazi occupied Holland. Its purpose was to teach us what happened and what she lived through.
Answer:
If John’s great-grandfather was killed as a child, John would not have been born. John would not have been able to travel back in time to take his great-grandfather to the circus. So his grandfather would not have been killed. If his grandfather had not been killed, John would have been born and could travel through time.
Answer:
It would be catastrophic (it would be a disastrous) if humanities greatest voyage (if humanities greatest quality/the human mind) was brought low (was held down) by the minds tendency to wander when left to its own devices. (by the minds tendency to wander when left by itself).
When the human mind is left alone, it may be great but also be horrible due to it often wandering.
HOPE THIS WILL HELP YOU!!!