Core Legal Answer & Context: This statement is a fundamental principle of contract law, highlighting the distinction between a mere agreement and a legally enforceable contract. While every contract necessarily originates from an agreement, not all agreements possess the legal enforceability required to be classified as contracts. This distinction is crucial for understanding the scope and limitations of contractual obligations.

Relevant Statutes and Sections:

1. Section 2(e), Indian Contract Act, 1872: Defines an 'agreement' as "every promise and every set of promises forming the consideration for each other."
2. Section 2(h), Indian Contract Act, 1872: Defines a 'contract' as "an agreement enforceable by law."
3. Section 10, Indian Contract Act, 1872: Lays down the essential elements for an agreement to become a contract: "All agreements are contracts if they are made by the free consent of parties competent to contract, for a lawful consideration and with a lawful object, and are not hereby expressly declared to be void."

Elucidation of the Statement: 1. All contracts are agreements: For an agreement to mature into a contract, it must first satisfy the basic definition of an agreement. An agreement is formed when there is a proposal (offer) by one party and its acceptance by another, resulting in a 'consensus ad idem' (meeting of minds) on the same thing in the same sense. Without an agreement, there can be no contract. Thus, the existence of an agreement is a prerequisite for a contract.

2. But all agreements are not contracts: This is the more critical part of the statement. An agreement becomes a contract only if it is 'enforceable by law'. This enforceability depends on the fulfillment of certain essential conditions, primarily outlined in Section 10 of the Indian Contract Act, 1872, and supplemented by common law principles. If an agreement lacks any of these essentials, it remains a mere agreement and does not acquire the legal status of a contract. The key essentials for an agreement to become a contract are: * Free Consent: The consent of the parties must be free, i.e., not caused by coercion, undue influence, fraud, misrepresentation, or mistake. * Competency of Parties: The parties must be competent to contract, meaning they must be of the age of majority, of sound mind, and not disqualified from contracting by any law. * Lawful Consideration: There must be a lawful consideration for the promise. Consideration is the 'price' for the promise, and it must be real, lawful, and not forbidden by law. * Lawful Object: The object or purpose of the agreement must be lawful and not forbidden by law, immoral, or opposed to public policy. * Not Expressly Declared Void: The agreement must not be one that is expressly declared to be void by law (e.g., agreements in restraint of trade, marriage, or legal proceedings; wagering agreements). * Intention to Create Legal Relations: Although not explicitly mentioned in Section 10, this is a crucial common law requirement. Parties must intend that their agreement should have legal consequences and be enforceable in a court of law. Social or domestic agreements typically lack this intention.

Examples of Agreements that are NOT Contracts:

• Social Agreements: An invitation to dinner or a promise to go to a movie. If one party fails to show up, the other cannot sue for breach of contract because there was no intention to create legal relations.
• Domestic Agreements: A husband promising to buy his wife a gift. These are generally presumed not to have legal enforceability unless there is clear evidence to the contrary.
• Agreements without Consideration: A promise to give someone a gift without anything in return (unless it falls under specific exceptions like natural love and affection).
• Agreements with Unlawful Object/Consideration: An agreement to commit a crime or an agreement for an immoral purpose.
• Agreements with Incompetent Parties: An agreement entered into by a minor (unless it's for necessaries).

Important Landmark Cases:

1. Balfour v. Balfour (1919): This English case is a classic illustration of an agreement lacking the intention to create legal relations. A husband promised to pay his wife a monthly allowance while he was abroad. The court held that it was a domestic arrangement and not a legally binding contract, as the parties did not intend legal consequences.
2. Rose and Frank Co. v. Crompton and Bros. Ltd. (1925): Here, the parties explicitly stated in their agreement that it was 'not entered into as a formal or legal agreement' and was 'only a definite expression and record of the purpose and intention of the three parties'. The court held that despite having offer, acceptance, and consideration, the express exclusion of legal intent meant it was not a contract.

Clear Conclusion: The statement accurately captures the hierarchical relationship between agreements and contracts. While an agreement forms the foundational element, it is only when an agreement satisfies all the legal prerequisites for enforceability – such as free consent, competency, lawful consideration and object, and the intention to create legal relations – that it transforms into a legally binding contract. Otherwise, it remains a mere agreement, devoid of legal consequences.