For he knoweth
yada` (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially
our frame
yetser (yay'-tser)
a form; figuratively, conception (i.e. purpose) -- frame, thing framed, imagination, mind, work.
he remembereth
zakar (zaw-kar')
to mark (so as to be recognized), i.e. to remember; by implication, to mention
that we are dust
`aphar (aw-fawr')
dust (as powdered or gray); hence, clay, earth, mud -- ashes, dust, earth, ground, morter, powder, rubbish.