All prophets are teachers. Not all teachers are prophets. Moses (ʿalayhi as-salām) was a prophet; so was Yeshua (ʿalayhi as-salām); so was Muhammed (these are but a few of many, of course). For me, Muhammed (sallallahu 'alayhi wa sallam) was the last of the prophets.
Bahá'u'lláh is one of the teachers (and some, of course, say that he is more than this.). The question to answer is why would Allāh (Subḥānahu ūta'āla) use him for this purpose? Perhaps it is to win the hearts of those who remain unconvinced by the prophets; or who cannot - for whatever reason - commit to those religions that regard these prophets as their own.
The fact remains that Bahá'u'lláh has brought people closer to the Beloved than might otherwise have been the case. And that alone is enough.
These are my opinions and, as such, may safely be rejected by others; without loss to themselves, or complaint from me.
That the soul can be brought into mystical union with the Beloved has always been accepted by those for whom He is a living reality, rather than an abstract concept.
Since I’ve a fondness for the Dominicans, have a look at this:
‘I have a capacity in my soul for taking in God entirely. I am as sure as I live that nothing is so near to me as God. God is nearer to me than I am to myself; my existence depends on the nearness and presence of God.
‘The man who abides in the will of God wills nothing else than what God is, and what He wills. If he were ill he would not wish to be well. If he really abides in God's will, all pain is to him a joy, all complication, simple: yea, even the pains of hell would be a joy to him. He is free and gone out from himself, and from all that he receives, he must be free. If my eye is to discern colour, it must itself be free from all colour. The eye with which I see God is the same with which God sees me. My eye and God's eye is one eye, and one sight, and one knowledge, and one love.
‘The soul has by nature two capacities. The one is intelligence, which may comprehend the Holy Trinity with all its works and be contained by It as water is by a vessel. When the vessel is full, it has enclosed all that is contained in it, and is united with that which it has enclosed, and of which it is full. Thus intelligence becomes one with that which it has understood and comprehended. It is united therewith by grace, as the Son is one with the Father.
‘The second capacity is Will. That is a nobler one, and its essential characteristic is to plunge into the Unknown which is God. There the Will lays hold of God in a mysterious manner, and the Unknown God imparts His impress to the Will. The Will draws thought and all the powers of the soul after it in its train, so that the soul becomes one with God by grace.
‘Various teachers have praised love greatly, as St Paul does, when he saith, “to whatever height I may attain, if I have not love, I am nothing.” But I set sanctification even above love; in the first place because the best thing in love is that it compels me to love God. Now it is a greater thing that I compel God to come to me, than that I compel myself to go to God. Sanctification compels God to come to me, and I prove this as follows:--
‘Everything settles in its own appropriate place; now God's proper place is that of oneness and holiness; these come from sanctification; therefore God must of necessity give Himself to a sanctified heart.
‘The philosopher Avicenna says, “The spirit which is truly sanctified attains to so lofty a degree that all which it sees is real, all which it desires is granted, and in all which it commands, it is obeyed.” When the free spirit is established in true sanctification, it draws God to itself, and were it placed beyond the reach of contingencies, it would assume the properties of God. But God cannot part with those to anyone; all that He can do for the sanctified spirit is to impart Himself to it. The man who is wholly sanctified is so drawn towards the Eternal, that no transitory thing may move him, no corporeal thing affect him, no earthly thing attract him. This was the meaning of St Paul when he said, “I live; yet not I; Christ liveth in me.”’
(Taken from: ‘Meister Eckhart’s Sermons’; translated by Claud Field).
Also taken from the Sermons:
‘All that may be said of the pains of hell is true. St Dionysius saith, “To be separated from God is hell, and the sight of God's countenance is heaven.”’
Have a great weekend!