The rationale for this special treatment of sealed contracts can be understood in terms of the legal formalities that are associated with sealing a document with a wax seal. Firstly, the following of the legal formality of affixing a seal to a document was evidence of the existence of a contract. Secondly, the need to use a seal – widely known to have legal significance – served to impress upon the parties the significance of the agreement being made. This element of deliberation is important in the context of many legal theories for why donative promises are not generally enforceable in the same way as contracts: there is a concern that donative promises are sometimes made under pressure (for example, from family members) without adequate deliberation, which explains why a requirement for the legal formality of the seal might substitute for consideration to give enforceability to donative promises. Thirdly, the following of the legal formalities through the use of a seal demonstrated beyond doubt that a legal transaction was intended by the parties.