徐橫山是王陽明畢生最難忘的弟子，他們的相識與相愛產生的奮勉，共譜心學獲得發端的序曲。徐橫山在王陽明生命遭遇最患難的時刻，卻毅然成為心學的信仰者，彼此共構出無法割裂的「我 —你關係」，他在王陽明愛的眷顧裡考上進士，將自己的生命奉獻給政府公職，深獲百姓的愛戴，卻發覺很難實踐理想，更企慕著領會本體，不惜捨棄公職，在霅上買田作為傳播心學的地點，不幸因病壯志未酬，在三十一歲的英年死亡。這對王陽明是很深的打擊，他在不同的時間裡書寫四篇祭文來抒發心裡無止盡的哀痛，並決志帶著對橫山的臨在感來闡發心學，其後期的弟子錢緒山雖然與徐橫山素未謀面，他藉由觀察橫山的妻子王守讓在橫山死亡後不懈呈現對橫山愛的臨在，領會出「中行」的生命特質，其生命會特別重視事上磨鍊，正顯示出陽明、橫山與緒山三人如何完成對彼此的忠信，他們三人對愛的深度真實跨越生與死的限隔，這就是我們說的「恆常臨在」。

Xu Heng-Shan is the most unforgettable disciple of Wang Yang-Ming in his whole life. The diligence stimulated from their meeting to love each other formed the overture of Nouslogy. Xu Heng-Shan determinedly became the believer of Nouslogy as the most difficulty time in Wang Yang-Ming’s life. They mutually constituted inseparable "I-Thou Relation." He passed the highest imperial examination with love of Wang Yang-Ming and dedicated his life to governmental service. He was deeply respected and supported by general public, however, he found that it is hard to fulfill ideal. He further hoped to grasp the Entity and therefore gave up public service without regret. He bought the farmland as the place for spreading Nouslogy. Unfortunately, he died in disease with his lofty aspirations unrealized at the age of 31. This was a deep shock to Wang Yang-Ming. He wrote four funeral orations in different times to express his endless mourning and decided to elaborate Nouslogy as if Heng-Shan was present. Though his disciple in later period, Qian Hsu-Shan, had never met Xu Heng-Shan, he grasped the life nature of "Zhong Xing" (internal experience and fulfillment of life) through observing the wife of Heng Shan, Wang Shou-Rang, about untiring presence of love toward Heng-Shan. He especially emphasize discipline of actual affairs that happened to show how Yang-Ming, Heng-Shan and Xu-Shan fulfilled fidelity to each other. The depth of love in them actually went across the line between life and death. This is what we said "Presence of Constancy."