"Food for thought" in a word

There is an uncommon word thoughtworthy: (used as thought-worthy also)

Worthy of thought or of being thought; considerable.

[en.wiktionary.org]

Though, considerable is a more common word with a close meaning but does not seem like a good fit for your example.

intriguing

adjective 1. arousing great interest or curiosity

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition http://www.collinsdictionary.com/dictionary/english/intriguing?showCookiePolicy=true

I don't know if a single word exists meaning "food for thought" or "worthy of consideration"; perhaps the closest modern English has is:

noteworthy

noteable

Or, with a slightly different hue:

memorable

While EL&U is an English website, ancient Hebrew has just such a word. That word is selah. If such a word existed in English, you wouldn't even need to preface it by the word that's!

Selah is quite commonly used in the Jewish Scripture in the book of Psalms. Despite the obscurity of the word's origin and meaning, it would seem to mean, at least in part:

• stop, or pause

• meditate/cogitate/ruminate on what has just been said

• take the passage's message to heart

Since the Hebrew psalms, an ancient form of poetry based primarily on parallelism, not rhyme, were meant primarily to be sung, we can imagine that as the choir director in the temple led the singers in a psalm, occasionally he would indicate a pause in the music as a way of letting the words which were being sung to "sink in" to those who were listening. In Handel's Messiah, there is such a pause in the final measures of the Hallelujah Chorus.

Nowadays, public speakers, for example, will simply repeat a particularly "meaty" sentence or quotation for emphasis, although in some public gatherings, such as at a memorial service, the speaker will sometimes intone,

"Let us observe a minute of silence in memory of [fill in the blank]"

Is there an equivalent, single English word? I doubt it. There should be, in my opinion. Until someone invents one, here are a few alternatives:

• Ruminate/cogitate/meditate on that.

• That's worth pondering/considering.

• Ponder/consider that.

• Mull that over.

There is in fact a single word which I am blanking on right now. It is a word which describes the power of a quotation, or memorable words, or a theory to stimulate further thought. The word is similar in meaning to prolific, which means having the power to generate many further thoughts and ramifications of the original quotation, words, or theory. When I think of the word, I'll edit my post accordingly.