God said to him [Eblis], 'You have become proud.' He replied, 'If I had been with you but a moment my pride would have been justified; I have been wi… - Mansur Al-Hallaj

Other than He cannot be qualified by two (opposite) qualities at one time; yet With Him they do not create opposition. He is hidden in His manifestation, manifest in His concealing.

"Truth is one, unique, single; it is
indivisibly One.
And its Oneness, and the knowledge of
that oneness belongs to him; is
placed in him.
Impossible, impossible; it is aloofness,
estrangement, separation; he is known only
by them.
Knowledge of One is abstract; single,
indivisible.
To say one, and to say single is to reach
the attribute; but he, who is one, is beyond
attribute.
If I say "I," he sends back "I," in answer
to my "I". So, "he" is for you and not for
me.
And if I say Unity is Oneness for his
loneliness, for his being alone, then I
placed him in
creation; among things created.
And if I say single One, as number one; how
can he come
within
number?
And if I say, he is One for as the
result of being considered one, being proved
One–then I
placed limit on him; delimited
him."

God, Most High, is the very one who Himself affirms His unity by the tongue of whatever of His creatures He wishes. If He Himself affirms His unity by my tongue, it is He and His affair. Otherwise, brother, I have nothing to do with affirming God's Unity.