If you don't already know them; I would highly-recommend The Letters of JRR Tolkien, edited by Humphrey Carpenter (1981) which are absolutely packed with fascinating and deep reflections.
In Letter 144 (25 April 1954) Tolkien makes a thought-provoking comment about the presence of Tom Bombadil in Lord of the Rings, and his importance to the story - which hits home on a matter I have been reflecting about over the past few years; the matter of the ideal form of human society, and (therefore) the nature of Heaven:
The story (of LotR) is cast in terms of a good side and a bad side, beauty against ruthless ugliness, tyranny against kingship, moderated freedom with consent against compulsion that has long lost any object save mere power, and so on; but both sides in some degree, conservative or destructive, want a measure of control.
But if you have, as it were, taken a 'vow of poverty', renounced control, and take your delight in things for themselves without reference to yourself, watching, observing, and to some extent knowing; then the question of the rights and wrongs of power and control might become utterly meaningless to you, and the means of power quite valueless.
It is a natural pacifist view, which always arises in the mind when there is a war.
But the view of Rivendell [i.e. the Council of Elrond] seems to be that it is an excellent thing to have represented, but that there are in fact things with which it cannot cope; and upon which its existence nonetheless depends. Ultimately only the victory of the West will allow Bombadil to continue, or even to survive. Nothing would be left for him in the world of Sauron.
I cannot, nowadays, shake the thought that it is the true goal of our Christian destiny to 'renounce control' in much the way that Bombadil represents; and that kingship, moderated freedom with consent; and an ideal of the control of the better over the worse - are all mortal expediencies that do not reflect the reality of Heaven.
What is more, the traditionalist ethical ideal epitomised by agrarian (pre-industrial) societies such as all those depicted in LotR (with the exception of the Ents and the Woses of the Druadan forest - since even Bombadil has a garden), seem more and more like mortal expediencies representing a phase in Man's development. The era of 'moderated control with consent' seems like an historic phase now receding.
Such ideals; which we see so inspiringly realised in the High Elves, Numenorean Men of Gondor, and even the Dwarves of Moria - are characterised by great arts and crafts, songs and poetry, courage and nobility, lore and knowledge... All of these ideals have been fading for several or many generations; and there seems waning support - and growing hostility - towards the requisite institutional basis of such a society (royals and nobles, guilds and professions, hierarchy and ritual, apprentices and canons).
In Barfield's terms, traditional society in LotR represents the evolving phase bridging between the unconscious immersive life of Original Participation (Ents and Woses) and the modern, disenchanted, materialist world termed the Consciousness Soul.
This evolution from Original Participation to the Consciousness Soul can be seen in terms of incrementally increasing control. As control increases, and in order to enable control; Man has become detached from nature, from The World; and regards living Nature as merely Things; so much material to be manipulated. Somehow, we have never been able to stop this tendency for increasing control at any intermediate or optimal level; once begun the quest for greater control seem to feed upon itself.
All moderating of the raw greed and lust for domination is, dissolved to mark the triumph of the bad side, ruthless ugliness, mere power and - inevitably - destruction. The spirit of Morgoth, Sauron and Saruman has already prevailed at the highest levels of authority, and the program is being rolled-out with accelerating velocity.
What lies beyond, and after this mortal life, is Final Participation, which is similar to what Bombadil represents. Final Participation is a renunciation of control - in contrast with Original Participation when control was neither sought nor even possible.
Voluntary renunciation of control power, domination, manipulation comes after the fullness of control has been either been grasped or else at least comprehended. My feeling is that this is what Bombadil represents; my notion is that at some point Bombadil had the possibility of power, domination and control - and chose to renounce it.
The tough aspect is that this is also a renunciation of much that we value most - such as arts, crafts, science, canonical accumulation of texts and the like. It is, in a genuine sense, a voluntary renunciation of civilisation.
In a sense this is an impossibility, just as pacifism is an impossibility in time of war (or, as pacifism is dependent upon that which it repudiates). Nonetheless, despite impossibility; what I think we have - at present, here and now - is the situation in which there is an irrevocable and cumulative loss of faith in those compromises (moderated controls) upon which civilisation depends - there is a mass withdrawal of 'consent'.
On one side this process is being encouraged, top-down, with evil motivation, by those who seek the destruction of civilisation because they believe it will lead to the self-chosen damnation of souls. This is Tolkien's bad side.
On the other side - which constitutes most of the good side; this top-down dismantling is opposed by (broadly) well motivated persons traditional religion and reactionaries of various types. However, it seems likely to me that the society they are fighting For (their positive goals, their alternative to the destructions and inversions of top-down evil) cannot happen.
'Moderated control by consent' is an earlier phase (the long transition-between Original Participation and the Consciousness Soul); a phase now gone, now not genuinely wanted, now irrecoverable. I feel that we either have been, or will be, called-upon to move beyond the incipient or actual absolute totalitarianism of the Consciousness Soul - move on to a Bombadil-like renunciation of power and the desire for control.
In Final Participation we are called-upon to take delight in things for themselves without reference to ourselves, watching, observing, and to some extent knowing; we are called upon to participate in creation directly in thinking - and not via arts and crafts and science.
This will come beyond death, because it is the nature of Heaven. The still-open question is whether it is meant also to come before death; or whether in this world it is impossible to actualise, and instead an ideal that we affirm even as we are overwhelmed by the worldly triumph of control.