This special issue is both timely and perfectly placed. Interest in heritage language (HL) learning has been growing for a while (Driver, 2022), as has the interest in the emotions of language learners and users (Dewaele & MacIntyre, 2014). By bringing these two strands together, the guest editors have created a powerful research synergy. Just as François Grosjean (1989) famously declared that bilinguals are not the sum of two complete or incomplete monolinguals but have a unique configuration, I would argue that research on the emotions of HL learners, teachers, and users in general can generate unique findings and insights that go beyond the original boundaries. The research presented in this special issue also benefited from recent theoretical, ontological, epistemological, and methodological developments. The first one is the move away from essentialist thinking. The second one is the dynamic view of language systems, both synchronically, diachronically, and contextually. No single aspect of a complex system can be neatly isolated and displayed in a glass case. No single variable follows a linear pattern in its development if the granularity is large enough. Patterns can go up and down; individuals may deviate from the general trend, and individuals may behave differently depending on a wide range of socio-contextual factors but also depending on their mood and degree of tiredness. Everything is loosely interconnected, within the individual, within the groups of peers, within the institution, and within the wider social, economic, historical, ideological, and political contexts. This means that everything can potentially have an influence on everything else and be influenced by it in return. Teachers who are overworked, underappreciated, underpaid, and unhappy risk burnout. Such an example is presented in Afreen and Norton's (2024, this issue) contribution to volunteer teaching. At the start of the 2-year period, the volunteers were struggling and had to use emotional labor strategies to keep a smile on their faces. By the end of the period, the working situation had improved, and teacher morale was better with a small remuneration and better organisation. Students are often emotional mirrors of their teachers. It means that many have suffered too, at the beginning of the study, through a process of negative emotional contagion (Moskowitz & Dewaele, 2021). There might have been unseen consequences, as learners may have transmitted this psychological burden to their families. The danger is that a process of negative reinforcement may initiate a negative spiral that affects the mental well-being and performance of teachers and students, parents, and children (see also How to cite this article: Dewaele, J.-M. (2024). Some considerations on the emotions of heritage language learners, teachers, and users.