Predeterminism. It is almost taboo to even consider the possibility that the Universe could be set in such a way. It has become fashionable to ridicule the idea (which is common across most religions), that there is something akin to a "plan" which the course of events follow; the rise in the popularity of atheism (despite its being a religion unto itself) is to thank for this trend, especially in the West. Despite our religious origins, we hide our spirituality away like a criminal trying to cover his crime. "We were more primitive back then", we say "humans didn't know as much about the world as they do now." Both claims are true. In fact, many of the claims to which science pertains, and thus the fashions of a religionless existence, are true. But the conclusions drawn from the information that we have amassed about the Universe are incomplete to say the least, and pitifully unfounded. We have in a sense, thrown out the baby with the bathwater in our complete rejection of religion; which for millennia has been the generator of humanity's main function of purpose, and thus action. Instead of creating a new reality in which the religious-ness of humanity may be preserved without resorting to the using of ideologies and un-based magics, we have rejected outrightly our religious nature, thinking that it makes us somehow more enlightened. On the contrary, it makes us far more primitive; man's greatest gift is the ability to shape reality with his conscious will, and if we choose to shape the world as a blind mass of matter and indestructible energy, without first questioning or considering the origin of the thing least known or observable by man, so it shall be. Even the modern practices of psychology and philosophy make no room for the mysteries of the character of consciousness in of itself; they both only explain the external (chemical and physiological reactions) and the externally applicable to culture (morality, ethics, and classical philosophy). These are not the source nor creators of consciousness, but rather its results and/or consequences.
Religion was humanity's answer to its own mystery, but now that it is slowly less and less accepted, there remains only the mystery. "But having just the mystery is fine" I hear them say, "Why do we have to have and know everything?" This sort of questioning is trademark of modern man, apathetic in the face of the unknown, and complacent in his own mystery. I answer: We can never know everything. Thus, we should at least try to know as much as we can; or better yet, understand all we can. What else may stave off the suffering that accompanies life but an understanding of its nature? Once a thing is understood, it may be truly be integrated "And why should integration be reached for?" Well, because understanding is difficult. I will say then, abandon all pursuits of knowledge, all pursuits of the arts, and any thing that would give you meaning, and see how quickly you will crave the difficulty of understanding. To suffer is better than to be nothing at all (or at least to be convinced that one is nothing), for if it were not so, humanity would not be an animal so fascinated with his own suffering, and its ultimate cure.
If one rejects the possibility that there is a force which moves all things to their respective close, and thus is an eternal recurrence of life and death, rebirth and new birth, then one discounts much of the observable nature of reality. The problem is that when one becomes fascinated by the literalness of destiny, it is twisted into something it isn't; much like other religious truths and insights into the soul. Once beheld by the masses, these truths are changed into what will suit the individual, rather than the individual changing to suit the nature of reality. If one considers the principle of destiny, and thus a predetermined existence, one sees many motifs common to humanity unfold; particularly those most commonly involved in the hero myth; the strength of will, will to power, will to learning, and so on. To say that one is destined for greatness, is not a metaphysical claim on the grounds of reality; rather, it is a claim of belief, and one of great power at that. If one is convinced that something is predetermined, and truly believes it in such a way that he would do whatever it takes to make this predeterminism come to pass, then it will inevitably come to pass. This is not to say that one can simply wish upon a star that their destiny will unfold, and all the necessary things will come to pass; I am saying that once an individual puts their faith in something greater than themselves (whatever that may be), and acts in accordance with this belief, the belief will lead to actions which will lead to the predetermined fulfillment. Now the key thing to note is that whatever deity or idol is assigned to a religion, is not the source of this plan, nor is it the source of anything. God, and the gods of all religions are manifestations of nothing else but humanity's own distilled consciousness, separate and un-integrated by the human mind. For what man wishes to be, is, and what he wishes not to be, isn't; even if it is only for him. In this way, we are each the Gods of our own realities. So what we believe is our destiny, is indeed what we should do. The chaos of nature and of reality will keep our wonton will in check, so that in the end, true destiny is the best one can do with what time and experiences they are given by the random selections of mother nature.
To believe in destiny, is not to believe in anything but one's ability to create reality, and if one so chooses, they can elect to not create it at all, in which case they are still participating in the creation of their reality. What one chooses to be their future will vary from person to person, but one thing is common across us all: The power for change remains within us, nowhere else; our lives will inevitably be a result of whatever we choose, whether we choose to choose or not to choose.