The ultimate source is the ROOT of all things. It is the origin or basis from which something develops or arises.' The term 'ultimate source' can be defined as the ROOT of all things, or the origin or basis from which something develops or arises. This term is often used to refer to the beginning of a process or journey, and can be applied to many different areas of life. For example, in business, the ultimate source could refer to the original idea or concept that led to the development of a product or service. In terms of personal growth, the ultimate source could refer to the core values or beliefs that guide an individual's decisions and actions. Ultimately, the ultimate source is the foundation upon which everything else is built.