What problem is central to the philosophy of modern times?

Since philosophical thought begins with the difference between being and thinking, the main problem of the modern era is the problem of finding the unity of being and thinking. On the one hand, this is a problem of the method, and on the other hand, it is his knowledge of a new subject. The most important truth is that there is only one solution to any problem. One single option is the solution to everything. Therefore, until it is found, all philosophizing is in vain.