Based on the provided texts, what was the primary spiritual lesson behind Sai Baba's practice of asking for Dakshina?

According to the insights in Chapter 14, the fundamental reason Sai Baba asked for Dakshina was to teach his followers a crucial spiritual lesson in humility. The text explicitly states, "The essence of this was that under the pretext of Dakshina, Baba was teaching His devotees to choose humility." This principle was demonstrated when He would command even a great millionaire to go to the houses of the poor and beg for the offering on His behalf. This practice served to dismantle pride and ego, reinforcing the idea that before Sai, all were equal, whether a wealthy person or a destitute beggar.