Like all people and groups without the tradition of political responsibility, the Jews are apt to see in the printed text of a document the sole and sufficient guarantee of political rights. Some of them have clung fantastically to the letter of the Mandate and have failed to understand its spirit. Practical politics, like mechanics, are governed by one golden rule: you can only get out of things what you put into them. The Mandate is a highly elastic document, which can only be transformed into an effective instrument by our own energies, efforts and results.
– Chaim Weizmann to the Seventeenth Zionist Congress (1 July, 1931), reproduced in Barnet Litvinoff ed., The letters and papers of Chaim Weizmann I.b (New Brunswick: Transaction, 1983), p. 617.