"A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts."
...William Strunk, Jr.
"...And I know I, as a writer, will often try to include a lot of empty space on the page so that the reader can complete my thoughts and sentences and so that her imagination has room to breathe."
...Pico Iyer
Sentence of Life. It sounds unusual, right? Or should we called it, "Life's Sentence?" But then it would sound like a prison term that lasts for the rest of a prisoner's life. That's one interpretation! Now, you see, it's just a word, 'sentence', yet it carries different meanings: it could be a word used in a court of law, or a string of words satisfying the grammatical use of a language. However you interpret it, it has an implication.
Now, lets look at a very good definition of a sentence,
"A sentence is a group of words that expresses a complete thought, question or, exclamation."
Check out this group of words,
"Let us eat Peter"
I didn't include any punctuation yet, 'cause I wanna punctuate it in different ways, pointing out certain things.
First, "Let us eat Peter."
Second, "Let us eat, Peter."