Final answer:
The purpose of the passage in the speech is to persuade that the approval of the UDHR should not be postponed further.
Step-by-step explanation:
In this passage, the purpose of the speech is to persuade that the approval of the UDHR should not be postponed further. The passage explains that while the UDHR is not legally binding, it carries weight in terms of social and economic pressure that can be used to urge governments to change their policies. The example of South Africa's abolition of apartheid after facing economic and social sanctions is given as evidence of this persuasive power.