I have not hid
kacah (kaw-saw')
to plump, i.e. fill up hollows; by implication, to cover (for clothing or secrecy) -- clad self, close, clothe, conceal, cover (self), (flee to) hide, overwhelm.
thy righteousness
tsdaqah (tsed-aw-kaw')
rightness (abstractly), subjectively (rectitude), objectively (justice), morally (virtue) or figuratively (prosperity) -- justice, moderately, right(-eous) (act, -ly, -ness).
within
tavek (taw'-vek)
a bisection, i.e. (by implication) the centre -- among(-st), between, half, (there-,where-), in(-to), middle, mid(-night), midst (among), out (of), through, with(-in).
my heart
leb (labe)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect
I have declared
'amar (aw-mar')
to say (used with great latitude)
thy faithfulness
'emuwnah (em-oo-naw')
literally firmness; figuratively security; morally fidelity -- faith(-ful, -ly, -ness, (man), set office, stability, steady, truly, truth, verily.
and thy salvation
tshuw`ah (tesh-oo-aw')
rescue (literal or figurative, pers., national or spir.) -- deliverance, help, safety, salvation, victory.
I have not concealed
kachad (kaw-khad')
to secrete, by act or word; hence (intensively) to destroy -- conceal, cut down (off), desolate, hide.
thy lovingkindness
checed (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
and thy truth
'emeth (eh'-meth)
stability; (figuratively) certainty, truth, trustworthiness -- assured(-ly), establishment, faithful, right, sure, true (-ly, -th), verity.
from the great
rab (rab)
abundant (in quantity, size, age, number, rank, quality)
congregation
qahal (kaw-hawl')
assemblage (usually concretely) -- assembly, company, congregation, multitude.