At the end of the paragraph, in sentences 5-6, Voltaire introduces an allusion primarily to advise Helvetius on the most effective style to use in future writings caution Helvetius on listening too much to the criticism of others in society discourage Helvetíus from further publishing in light of his societal position encourage Helvetius to continue writing regardless of his societal position

nobody can deny that cars are the most used means of transport all over the world. however owing a car could have some disadvantages. first of all, having a car on your own allows you to go everywhere without depending on timetables. moreover, you can use it whenever you need it no matter the time or the climate conditions. furthermore, if you have a car, you would not have to wait for nobody to share it when going to somewhere. nevertheless, one major disadvantages of owing a car is the fact that fuel is very expensive nowadays so that not everyone can afford it. in addition, you have to pay insurance to be protected by legal conditions. apart from this, the person who owns a car always has to maintain the car and repair any mechanical problem which could costs a huge amount of money. what is more, if you have to travel long distances, and you do not like driving, one probably would be exhausted and irritated due to driving for a long time. besides, cars cause environmental pollution. to sum up, owing a car means that you have more freedom to travel whenever and wherever people want to, however the car maintenance could be a very expensive issue that can have bad consequences at your economy.

the answer is:

in the fourth paragraph. ( the paragraph that begins with “on friday of my third ”).

hope it !