Charles Taylor is one of the leading living philosophers. In this book Arto Laitinen studies and develops further Taylor's philosophical views on human agency, personhood, selfhood and identity. He defends Taylor's view that our ethical understandings of values (so called "strong evaluations") play a central role. The book also develops and defends Taylor's form of value realism as a view on the nature of ethical values, or values in general. The book criticizes Taylor's view that God, nature or human reason are possible constitutive sources of value – Laitinen argues that we should drop the whole notion of a constitutive source.