ans1:the tortures of excessive questions had driven him to say the truths he knew.
ans2:the heritage being alluded in the 1st paragraph is all progress that has been done on the planet to make the life easier and comfortable.
ans3:when we will be settled down to all the discoveries that has been made on the planet that will be the betrayal of our trust.
ans4:we need to question the old truths and work for the new ones for the sake of future generation ,as had been done for us in the past.