Paul asserts that he has the freedom to exercise his rights as an apostle but has determined no to asserts his right to the detriment of others. Our liberty must always be exercised with Christian charity.--Question- What rights are you not willing to give up for the sake of the Gospel and your brother-
Acceptable worship comes from a grateful heart for what God has done and not from a heart that is seeking approval of its self before God or trying to justify its own worthiness.