"No preacher is listened to but time, which gives us the same train and turn of thought that elder people have in vain tried to put into our heads before."

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Using trees as a symbol of peace is in keeping with a widespread African tradition. For example, the elders of the Kikuyu carried a staff from the thigi tree that, when placed between two disputing sides, caused them to stop fighting and seek reconciliation. Many communities in Africa have these traditions.

— Wangari Maathai