In a letter written by Rudolf Hess to Walter Hewel in 1927, Hess paraphrases Hitler's vision: "World peace is certainly an ideal worth striving for; in Hitler's opinion it will be realizable only when one power, the racially best one, has attained complete and uncontested supremacy. That [power] can then provide a sort of world police, seeing to it at the same time that the most valuable race is guaranteed the necessary living space. And if no other way is open to them, the lower races will have to restrict themselves accordingly".[15]