FYI,
Shakyamuni & Ananda, in their past, both started to learn BuddhaDharma at the same time. They both generated Bodhicitta at the same time. however, Shakyamuni became Buddhahood first. the main result is because, Shakyamuni study one method and practice all the way, while Ananda, like many of us, like to learn some of this and learn some of that. hence the delay. they set an example to be more focus in Dharma.
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