The synthetic parallel that the verse uses has to do with showing special emphasis to the first part of the verse and then, the second part consists of an expansion of the idea.
Explanation:
The first part of the Psalm 111:1 says <em>"Praise the Lord"</em> which means that the writer of this Psalm worship God. When It says "Lord" with cappital letter It refers to God. Then, the second part of the Psalm says <em>"I will extol the Lord with all my heart in the council of the upright and in the assembly" </em>which says practically the same as the first part of the Psalm but here we can see that there is an explanation of the writer. He says that he will extol the Lord with all his heart in the council of the upright and in the assembly. Synthetic parallelism involves an expansion of the idea that is written in the first part.
