Gevurah
Severity / strength — anatomical left shoulder
Gevurah — strength as the power of restraint, judgement, and limit. Associated with Isaac and the left arm of Adam Kadmon. It is the discipline that gives form to Chesed's flow; without it, kindness dissipates and structure cannot hold. In the kabbalistic theodicy Gevurah is also the root of stern judgement, and unbalanced Gevurah is the structural origin of the sitra achra (the 'other side', the Qliphoth). Isaac's binding (the Akedah) is read as the paradigmatic Gevurah-event.
Point 5 of 10 in Kabbalah — Tree of Life (Adam Kadmon)
Cross-tradition overlaps
No overlapping points are registered for this point.
Sources
Zohar I.151a (primary_canonical)
Zohar I.151a (Vilna folio pagination) links Isaac and the left-side quality of Gevurah with judgement and restraint. It documents the traditional symbolic pairing behind the diagram's Gevurah placement.