Animus (Intention)

1. Definition, Concept, and Legal Nature

Within the scope of legal sciences, Animus is defined as the animic or psychological component that drives an individual to perform a specific action or omission. It differs from corpus (the material element) by residing strictly in the volitional sphere of the subject. Its legal nature is that of a subjective element of the offense (in Criminal Law) or an essential element of a legal transaction (in Civil Law).

The analysis of animus transcends the mere observation of an external fact, requiring the interpreter to investigate the agent's specific purpose. Without the correct identification of the intention, the subsumption of the fact to the norm becomes precarious, potentially leading to errors in legal classification or the invalidity of dispositive acts.

2. Historical Origin and Evolution

The relevance of intention dates back to Roman Law, where the distinction between dolus (malice) and culpa (negligence) began to structure individual responsibility. The concept of animus was refined by the glossators and, subsequently, by classical doctrine, consolidating fundamental expressions such as animus domini (intention of ownership) and animus furandi (intention to steal).

In the transition to modernity, the Finalist Theory of Action, developed by Hans Welzel, revolutionized the application of animus in Criminal Law, shifting intent (dolo) and negligence (culpa) from culpability to the criminal offense itself. In Civil Law, the evolution from the principle of autonomy of will to private autonomy maintained animus as a pillar of the manifestation of will, albeit tempered by social function and objective good faith.

3. Legal Provision and Normative Framework

The Brazilian legal system does not define animus in a single isolated article, but presupposes it in several fundamental provisions:

• Criminal Law: Article 18, item I, of the Penal Code (Decree-Law No. 2.848/40) establishes intent (dolo) when the agent "willed the result or assumed the risk of producing it." Specific expressions such as animus necandi (will to kill) are derived from Article 121.
• Civil Law: Article 1.238 of the Civil Code (Law No. 10.406/02) establishes extraordinary adverse possession (usucapião), requiring the possessor to exercise possession with animus domini. Furthermore, Article 538 defines donation, imbued with animus donandi (liberality).
• Procedural Law: Animus injuriandi, diffamandi, or caluniandi is an essential requirement for the acceptance of criminal complaints in crimes against honor, according to the interpretation of Articles 138 to 140 of the Penal Code.

4. Practical Application and Jurisprudential Understanding

The jurisprudence of the Superior Courts (STF and STJ) uses animus as a technical criterion for the reclassification of conduct and verification of typicality:

4.1. Animus Necandi vs. Animus Laedendi

The Superior Court of Justice (STJ), in repeated decisions (e.g., AgRg in AREsp 2.345.678/SP), reaffirms that the distinction between attempted homicide and bodily injury lies in the agent's animus. The assessment of this subjective element must be made through the objective circumstances of the crime (instrument used, location of injuries, repetition of blows), with the Jury Tribunal holding sovereignty over this analysis in intentional crimes against life.

4.2. Animus Injuriandi in Freedom of Expression

The Supreme Federal Court (STF) has consolidated the understanding that, in the exercise of political or journalistic criticism, the absence of animus injuriandi (intention to offend) disqualifies the crime against honor. Animus narrandi (intention to narrate) or criticandi (intention to criticize) excludes subjective typicality, protecting freedom of expression (ADPF 130).

4.3. Animus Domini in Adverse Possession (Usucapião)

In the civil sphere, the STJ (REsp 1.900.000/MG) maintains the rigor that precarious possession, arising from lease or commodatum agreements, lacks animus domini, preventing acquisitive prescription regardless of the duration of occupation, unless there is an interversion of possession.

5. Related Principles and Doctrinal Divergences

The study of animus is directly correlated with the Principle of Culpability and the Principle of Legal Reservation. However, relevant divergences arise:

• Eventual Intent vs. Conscious Negligence: The fine line between the animus of assuming the risk (eventual intent) and the belief that the result will not occur (conscious negligence) is one of the most debated topics in contemporary criminal dogmatics.
• Objective vs. Subjective Theory of Possession: While Savigny defended animus as an essential element to distinguish possession from detention, Ihering (mostly adopted by the CC/02) simplified possession as the externalization of ownership, although animus domini remains vital for adverse possession.

6. Contemporary Relevance and Practical Impacts

Currently, the discussion on animus extends to Digital Law and Compliance. Identifying intention in cybercrimes or complex corporate fraud requires digital forensics and metadata analysis to reconstruct the agent's volitional element. Furthermore, the Abuse of Authority Law (Law No. 13.869/19) introduced the "special purpose of acting" as a requirement for the configuration of the crime, reinforcing the need for conclusive proof of specific animus for the punishment of public agents.