Definition of Truism
Truism is a literary device defined as a announcement that is primarily based on self-evidence or factual evidence. And is customary as an obvious truth in a way that in addition proof isn't always considered necessary. It is likewise that a contradicting assertion would be taken into consideration as illogical, given that truism is agreed to be fact. It is on the whole used as a rhetorical tool in philosophy, specially in logic.

Several statements and aphorisms also are examples of truism whilst they gift a universally commonplace opinion, and whilst a majority of the human beings agree with them. Platitudes, clichés, and bromides are some truism examples.

Examples of Truism in Literature
Example #1: Oedipus Rex (By Sophocles)
“(The oracle) instructed him
that it become his fate that he should die a victim
at the arms of his personal son, a son to be born
of Laius and me …”

“That I turned into fated to lie with my mom,
and display to sunlight hours an accursed breed
which men might not endure, and I become doomed
to be assassin of the father that begot me …”

In this excerpt, Jocasta recollects the prophecy that the oracle mentioned to King Laius earlier than the delivery of Oedipus. In the second paragraph, Oedipus also famous that prophecy, and for this reason leaves Corinth. These statements are the best examples of truism, wherein the reality is apparent and nobody can deny it.

Example #2: Hamlet (By William Shakespeare)
“O, that this too too solid flesh could melt
Thaw and clear up itself into a dew!
Or that the Everlasting had not fix’d
His cannon ‘gainst self-slaughter! O God! God!
How weary, stale, flat and unprofitable, …
Hyperion to a satyr; so loving to my mother
That he might not beteem the winds of heaven
Visit her face too roughly. Heaven and earth!
Must I remember? Why, she could grasp on him…”

This is Hamlet’s well-known soliloquy, and it is a good example of truism. Hamlet was enraged at his mom for marrying his uncle after the demise of the king a month previous. He is expressing his feelings of dejection for his mom’s greed.

Example #3: Mourning Becomes Electra (By Eugene O’Neil)
“He pushes his back up towards the top of the bed in a half sitting position. His face, with the flickering candle light… You like the dark where you can’t see your antique man of a husband, is that it … I don’t know… This house isn't my house. This isn't always my room nor my bed. They are empty… And you aren't my spouse! You are watching for something … You made me seem a lustful beast in my own eyes… I might experience purifier now if I had gone to a brothel! I would feel greater honor between myself and life…”

In this extract, Mannon is speaking to his spouse Christine, and offers self-obtrusive statements. He talks approximately his spouse’s unfaithfulness to him. This is a truism based on generic reality that his wife has had an affair.

Example #4: Romeo and Juliet (By William Shakespeare)
“Let Romeo hence in haste,
Else, whilst he’s found, that hour is his last.
Bear as a result this frame and attend our will.
Mercy however murders, pardoning those who kill.”

In this excerpt, Prince is angry because of Romeo’s killing of Tybalt, and says that he need to leave the city. Here the assertion of truism is used as he later says:

“Showing mercy to murderers might create extra killers or murderers.”

Example #5: A Tale of Two Cities (By Charles Dickens)
“It turned into the nice of times, it turned into the worst of times, it turned into the age of wisdom, it was the age of foolishness, it was the epoch of belief, it became the epoch of incredulity, it changed into the season of Light, it changed into the season of Darkness, it become the spring of hope, it was the wintry weather of despair.”

Here, the double meanings of the “fine of times” and the “worst of times” imply the theme of resurrection, and also indicate the struggle among England and France. These statements are expressing truism.

Function of Truism
Truism is a selected class of fact, platitude, or cliché, and is used as evidence. It is used as an agreed or intuitive truth approximately life, because the majority of humans take delivery of it, and arguments are so best that readers do not ask questions. It is likewise used in literature and philosophical writings in which it serves an ironic purpose.
Trope Understatement