From Longman Dictionary of Contemporary Englishguiding light/hand/starguiding light/hand/starsomeone whose ideas and advice people follow Eddie was his hero – his guiding light. He really needed a guiding hand. → guiding
Examples from the Corpus
guiding light/hand/star• Eddie was his hero, his guiding light.• To followers, he is more than just a guiding light - he is the Messiah.• And that is what Aeneas's young son did under the guiding hand of Alecto.• That will be the guiding light of the next Labour government.• Under Mr Yarrow's guiding hand, the reputation of the school was untarnished, these five long years.• Father Peter, its guiding light, was also its provider of funds and sustenance. 