straight from the horse's mouth
mother
firsthand
at first hand
springhead
root
have something on good authority
fons et origo
emanate
aliunde
parent
whence
authorship
ab origine
preorigin
out of
rise
rooted
ur-source
strike
from good hands
from the ground up
speak by the card
explicably
adventitious
preanalytically
prefatorily
intersource
derivation
originatively
factically
hereon
factually
grass roots
xenogenesis
a posteriori
datum
punctum saliens
from the jump
fount
call out
foretest
preliminary
groundwork
totally
evidentially
trufax
get the drift
ipso facto
primitively
in the beginning
according to one's understanding
originally
preinterpret
in the light of
de novo
newly-formed
hypostasis
by
come from
dead-on
enunciate
descendant
data point
exord
pertinently
elsewhence
this
in this connection
tectonically
proceed
preparatively
entirely
confirmatively
secondhand
factualist
outformation
worldwide
strengthen
universal
oecumenical
cosmopolitan
general
a-
seminally
world-wide
scripture
source language
underpinning
ecumenical
magisterium
from the off
da capo
ab ovo
preparingly