The heart
leb (labe)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect
knoweth
yada` (yaw-dah')
to know (properly, to ascertain by seeing); used in a great variety of senses, figuratively, literally, euphemistically and inferentially
his own
nephesh (neh'-fesh)
a breathing creature, i.e. animal of (abstractly) vitality; used very widely in a literal, accommodated or figurative sense (bodily or mental)
bitterness
morrah (mor-raw')
trouble -- bitterness.
and a stranger
zuwr (zoor)
to turn aside (especially for lodging); hence to be a foreigner, strange, profane; specifically (active participle) to commit adultery
doth not intermeddle
`arab (aw-rab')
to braid, i.e. intermix; technically, to traffic (as if by barter); also or give to be security (as a kind of exchange)
with his joy
simchah (sim-khaw')
blithesomeness or glee, (religious or festival) -- exceeding(-ly), gladness, joy(-fulness), mirth, pleasure, rejoice(-ing).