The wording for that right in the first two paragraphs results from the case-law (Court of Justice judgment of 15 October 1987 in Case 222/86 Heylens [1987] ECR 4097, paragraph 15 of the grounds, judgment of 18 October 1989 in Case 374/87 Orkem [1989] ECR 3283, judgment of 21 November 1991 in Case C-269/90 TU München [1991] ECR I-5469, and Court of First Instance judgments of 6 December 1994 in Case T-450/93 Lisrestal [1994] ECR II-1177, 18 September 1995 in Case T-167/94 Nölle [1995] ECR II-2589) and the wording regarding the obligation to give reasons comes from Article 296 of the Treaty on the Functioning of the European Union (cf. also the legal base in Article 298 of the Treaty on the Functioning of the European Union for the adoption of legislation in the interest of an open, efficient and independent European administration).
Is ón gcásdlí a eascraíonn an fhoclaíocht atá ar an gceart sin sa chéad dá mhír (breithiúnas na Cúirte Breithiúnais an 15 Deireadh Fómhair 1987, i gCás 222/86 Heylens [1987] ECR 4097, mír 15 den a forais, breithiúnas an 18 Deireadh Fómhair 1989 i gCás 374/87 Orkem [1989] ECR 3283, breithiúnas an 21 Samhain 1991 i gCás C–269/90, TU München [1991] ECR I-5469, agus breithiúnais na Cúirte Céadchéime an 6 Nollaig 1994 i gCás T–450/93, Lisrestal [1994] ECR, II–1177, an 18 Meán Fómhair 1995 i gCás T167/94 Nölle [1995] ECR II–2589) agus is as Airteagal 296 den Chonradh ar Fheidhmiú an Aontais Eorpaigh a thagann an fhoclaíocht maidir leis an oibleagáid réasúin a lua (féach freisin an bonn dlíthiúil in Airteagal 298 den Chonradh ar Fheidhmiú an Aontais Eorpaigh chun reachtaíocht a ghlacadh ar mhaithe le riarachán Eorpach atá oscailte, éifeachtach, neamhspleách).