It is False that an observer must know that social learning is occurring for it to be effective.
A metaphor for courage might be describing someone as having "the heart of a lion". He does not actually have the heart of a lion, it's a metaphor to show that he is courageous.
Although not recognized immediately after the battle and after the war. It's significance became noted after Lincoln's assignation in 1865. Politicians and historians began to analyze the significance of the speech after his death to further understand the war and the abolishment of slavery.
