My mouth
peh (peh)
the mouth (as the means of blowing), whether literal or figurative (particularly speech); specifically edge, portion or side; adverbially (with preposition) according to
shall speak
dabar (daw-bar')
perhaps properly, to arrange; but used figuratively (of words), to speak; rarely (in a destructive sense) to subdue
of wisdom
chokmowth (khok-moth')
wisdom -- wisdom, every wise (woman).
and the meditation
haguwth (haw-gooth')
musing -- meditation.
of my heart
leb (labe)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect
shall be of understanding
tabuwn (taw-boon')
intelligence; by implication, an argument; by extension, caprice -- discretion, reason, skilfulness, understanding, wisdom.