As mentioned before, God is very detailed and orderly. He gave clear instructions on how the Israelites were to gather and manage the manna and quail, yet many still chose not to follow them. God managed His blessing to where the Israelites had no choice but to follow His guidance in reference to the food. This shows that while God provides, but we have to do our part and be obedient, and rely on Him.
In 1 Corinthians 9, Paul acknowledges that he has certain rights, but he chooses not to exercise them simply because he can. Instead, he gives them up to better serve others. This reflects self-discipline and the importance of putting purpose and others ahead of personal freedoms.