Rewrite the following sentences in a way that maintains a formal tone. Output the rewritten sentences.
I really dug the essay that I read yesterday. It made me think about a lot of stuff.
I thoroughly enjoyed the essay that I perused yesterday. It provoked a significant amount of introspection on various matters.
Complete the following task based on the instruction and optional input provided.### Instruction:
Rewrite the following sentences in a way that maintains a formal tone. Output the rewritten sentences.

### Input:
I really dug the essay that I read yesterday. It made me think about a lot of stuff.

### Output:
I thoroughly enjoyed the essay that I perused yesterday. It provoked a significant amount of introspection on various matters.