To tell you the truth...

What is truth? A mobile army of metaphors, metonymies, anthropomorphisms: in short a sum of human relations which became poetically and rhetorically intensified, metamorphosed, adorned, and after long usage seem to a nation fixed, canonic and binding: truths are illusions of which one has forgotten they are illusions; worn-out metaphors which have become powerless to affect the senses; coins with their images effaced and now no longer of account as coins but merely as metal.

(Nietzsche: "On truth", 1873)

Unity in Writing

Therefore ask yourself some basic questions before you start.

For example:

• "In what capacity am I going to address the reader?" (Reporter? Provider of information? Average man or woman?)
• "What pronoun and tense am I going to use?" "What style?" (Impersonal reportorial? Personal but formal? Personal and casual?)
• "What attitude am I going to take toward the material?" (Involved? Detached? Judgmental? Ironic? Amused?)
• "How much do I want to cover?"
• "What one point do I want to make?"

[...] Every writing project must be reduced before you start to write. Therefore think small. Decide what corner of your subject you're going to bite off, and be content to cover it well and stop.
[...] As for what point you want to make, every successful piece of nonfiction should leave the reader with one provocative thought that he or she didn't have before. Not two thoughts, or five—just one. So decide what single point you want to leave in the reader's mind. It will not only give you a better idea of what route you should follow and what destination you hope to reach; it will affect your decision about tone and attitude. Some points are best made by earnestness, some by dry understatement, some by humor.

William Zinsser, "On Writing Well. The definitive Guide to Writing Nonfiction"

Todd Andrews' Five Conclusions

• Nothing has any intrinsic value;
• the reasons for which people attribute value to things are always ultimately irrational;
• there is, therefore, no ultimate “reason” for valuing anything;
• living is action and there is no final reason for action;
• and there is no final reason for living (or for suicide).

John Barth’s The Floating Opera.