guiding spirit
noun [ C usually singular ] uk/ˌɡaɪ.dɪŋ ˈspɪr.ɪt/ us/ˌɡaɪ.dɪŋ ˈspɪr.ət/ (also guiding light)
指路人，指路明灯，舵手
a person who influences a person or group and shows them how to do something successfully
She was the founder of the company and its guiding spirit. 她是公司的奠基人，同时也是公司的领路者。