Internal vs External Tension: Two Layers of Conflict in Character

Honestly, the events that befall a character do not, by themselves, make him believable. What keeps the reader in the chair is the gap that opens between the event and the character's mind; a place where an external occurrence awakens an internal question. A novel with only incident is a car with the gas pedal pressed and no driver; and a narrative with only interiority is a person who sits all day thinking about himself. The writer's job is to build the gearbox between these two.
\n\nExternal Tension: The Engine the Reader Sees
\nExternal tension has three components: a clear goal, a stubborn obstacle, and a deadline that cannot be escaped. In Hemingway's The Old Man and the Sea, the old fisherman faces a giant fish, a thin line, and a wounded hand. In The Count of Monte Cristo, Edmond Dantès is confined in a cell and is hatching a plan. This layer has the task of propulsion: it tells the reader why to turn the next page.
\nBut the condition for its effectiveness is that the obstacle cost the character dearly. If the hero can ignore the cost or escape the predicament with a simple decision, then what we have built is an acrobatic show, not suspense.
\n\nInternal Tension: The Battle Raging in the Dark
\nInternal conflict is the confrontation of two incompatible desires in a single mind: safety versus freedom, loyalty versus truth, preserving reputation versus desire. Raskolnikov in Crime and Punishment faces an external investigator, but his real war is with a question he himself has posed: Did I have the right to kill? Porfiry applies almost no physical force to him; he talks, and Raskolnikov collapses under the weight of those very words.
\nPersian literature has also tested this layer powerfully. The narrator of Sadegh Hedayat's The Blind Owl has no significant external event; all the pull comes from the gradual disintegration of a mind that cannot be trusted. In Houshang Golshiri's Prince Ehtejab, the external decline of a dynasty becomes merely a mirror for the narrator's internal decline. This same pattern is repeated in Asghar Farhadi's cinema: in A Separation\n