Occasionally he took us on a picnic or a camping trip and taught us many valuable lessons. The chief one was to remember that camping was a good way to find out people’s characters. Those who were selfish showed it very soon, in that they wanted the best bed or the best food and did not want to do their share of the work.

Eleanor Roosevelt (1884–1962) American politician, diplomat, activist; First Lady of the US (1933–45)
Memoir (1937), This Is My Story, ch. 2 “Adolescence”
    (Source)

Referring to her uncle, Teddy Roosevelt.

The same passage is included in her compiled 1961 Autobiography, Part 1, ch. 2 "Adolescence."