“Our slogan is Australia Unlimited, and we pronounce it with confidence.”
Election speech, Canterbury, Victoria, 29 October, 1958 https://electionspeeches.moadoph.gov.au/speeches/1958-robert-menzies
Second Term as Prime Minister (1949-1966)
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Robert Menzies 22
Australian politician, 12th Prime Minister of Australia 1894–1978Related quotes

“Armed with the knowledge of our past, we can with confidence charter a course for our future.”
Speech at Founding Rally of the Organization of Afro-American Unity (28 June 1964), as quoted in By Any Means Necessary (1970)
By any means necessary: speeches, interviews, and a letter (1970)
Context: Armed with the knowledge of our past, we can with confidence charter a course for our future. Culture is an indispensable weapon in the freedom struggle. We must take hold of it and forge the future with the past.

“We confide in our strength, without boasting of it; we respect that of others, without fearing it.”
Letter to William Carmichael and William Short (1793)
1790s
“We have to serve ourselves for many years before we gain our own confidence.”
Source: Meditations in Wall Street (1940), p. 104

“We, holding Art in our hands, confidently consider ourselves to be its masters”
Nobel lecture (1970)
Context: We, holding Art in our hands, confidently consider ourselves to be its masters; boldly we direct it, we renew, reform and manifest it; we sell it for money, use it to please those in power; turn to it at one moment for amusement — right down to popular songs and night-clubs, and at another — grabbing the nearest weapon, cork or cudgel — for the passing needs of politics and for narrow-minded social ends. But art is not defiled by our efforts, neither does it thereby depart from its true nature, but on each occasion and in each application it gives to us a part of its secret inner light.
“Whatever we expect with confidence becomes our own self-fulfilling prophecy.”

“Our lack of confidence is not the result of difficulty. The difficulty comes from our lack of confidence.”
At quanto ego de illis melius existimo! ipsi quoque haec possunt facere, sed nolunt. Denique quem umquam ista destituere temptantem? cui non faciliora apparuere in actu? Non quia difficilia sunt non audemus, sed quia non audemus difficilia sunt.
Also translated as: It is not because things are difficult that we do not dare, but because we do not dare, things are difficult.
Letter CIV, verse 26
Epistulae Morales ad Lucilium (Moral Letters to Lucilius)
Context: But how much more highly do I think of these men! They can do these things, but decline to do them. To whom that ever tried have these tasks proved false? To what man did they not seem easier in the doing? Our lack of confidence is not the result of difficulty. The difficulty comes from our lack of confidence.

"Unsaid" http://www.danagioia.net/poems/unsaid.htm
Poetry, Interrogations at Noon (2001)