Symbolism

(source: theodora.com)

The flag overall symbolizes patriotism and national pride formed its shapes and colors. The flag has a big white cross which is a symbol of salvation that divides it into four quadrants: red and blue. The blue area of the flag is a representation of liberty and the red part is representation of the blood of the heros who died to preserve it.

(source: allstates-flag.com)

The symbol in the center of the Dominican flag is known as the Dominican coat of arms. It has a shield with the same colors as the flag. It also has a bay laurel branch on the left and a palm frond on the right. Above the shield a blue ribbon displays the country's motto Dios (God), Patria (Fatherland), Libertad (Liberty).

At the bottom of the shield Republica Dominicana is shown on a red ribbon. In the center of the shield, flanked by three spears holding the Dominican banner and holding that is the bible with a small golden cross above it. The myth is that the bible is opened to the Gospel of John 8:32 which reads "Y la verdad os hara libre" (And the truth shall make you free).




Sources:
Symbolism
Coat of Arms
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Flag
Coat of Arms