Holt believed it was his responsibility as prime minister "to reflect the modern Australia to my fellow countrymen, to our allies and the outside world at large". His approach to national security emphasised opposition to international communism and the need to engage more with Asia. Holt said that the "great central fact of modern history" was "the tremendous power conflict between the communist world and the free world". He was a strong believer in the domino theory and containment, holding that communism had to be fought wherever it occurred in order to prevent it spreading to neighbouring countries. In April 1967, Holt told parliament that "geographically we are part of Asia, and increasingly we have become aware of our involvement in the affairs of Asia – our greatest dangers and our highest hopes are centred in Asia's tomorrows". Gough Whitlam said that Holt "made Australia better known in Asia and he made Australians more aware of Asia than ever before [...] this I believe was his most important contribution to our future".