My cousin wanted to buy a car and asked me to borrow money. I felt that it was not the right time to buy a car now, I said that I could lend him money at the end of the year, or buy it a few years later, and I also told him on the phone that buying a car was not ok

My cousin wanted to buy a car and asked me to borrow money. I think it is not the time to buy a car now, I said that I can lend him money at the end of the year, or buy it a few years later, I also told him on the phone that buying a car can not be crossed, after buying a car, you have to keep spending money, light oil money, maintenance costs, maintenance fees, insurance fees, parking fees and a large amount of expenses are behind. And the car is depreciated when it is bought, it is not worth it, but he seems to have an iron heart to buy, how can I persuade him?