on firm foundations and bedrock...

Because GOD wanted to make the unchanging nature of his purpose very clear to the heirs of which was promised, he confirmed it with an oath. God did this so that... we who have fled to take hold of the hope... may be greatly encouraged.
We have this hope as an anchor for the soul, firm and secure. It enters the inner sanctuary behind the curtain...
~Hebrews 17-19

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so here, the writer of hebrews is encouraging in his words and assures two things:
1)God's promises will come true. (i.e. given what we are "promised")
2)God's promises are to be our hope and foundation (see vs. 19)

at the same (God-sovereign-i-cannot-believe-this-is-coincidence) time, i was doing some reading for my earthquake class and learned how the intensity of shaking of an earthquake is far less when a structure is on bedrock rather than loose sediments.(common sense, i know)

And so i got a-thinking of the differences in the rock structure. Bedrock is one big chunka rock while sediments are made up of different little parts.

so that is, if we stand on God's word, as the ONLY thing on which we base things on in our lives, because He's eternal, we won't be shaken (see various psalms).

or, if you're prone to be such as yours truly, you collect a myriad of small accomplishments to stand on and glorify yourself. when shaking comes, not only are you shaken harder, but physical equilibrium laws dictate that at the end, you'll either be:
A) swallowed up by the soil and start sinking (aka. liquifaction)
B) leveled even. your mound will be well... flat
C) everything you've built on top of that horrific foundation will be destroyed

fun propositions...

but it doesn't have to be this way. God is like an awesomely build wooden (i'm serious, these are the safest) house n' infallable earthquake insurance.

(more thoughts on this later... off to the gym!)