The cloister of San Agustin conforms to the design found in Europe as well as the Americas prevalent during the colonial period. The four corridors in the cloister have at each corner ornately carved baroque retablos with reliefs/paintings of saints believed to have been added in the 18th century. Here, processions as well as the friars used to pass and stop for prayers and rituals.

At the far end of the church interior is the presbitery where one can find the altar mayor or main altar. It is made of carara marble and was installed in 1934 which replaced the original made of wood.

The huge retablo just behind it catches the eye. Its top is crowned by the image of the Holy Spirit in the form of a dove with Saint Augustin at the lower center dressed in white robes flanked by two angels. The grand niche contains the statue of St. Paul.

A look inside San Agustin church is a look into the grandeur of a bygone era as well as the power that the Catholic church wielded during the Spanish colonial years. One is only awed with amazement gazing at these ornate and fabulous richness and artistry.