Mark today, this is the ... difference between the first part of the Vedas and the second. In the first, it is all in [the domain of] sense. But all religions are only [concerned with the] infinite of the external world — nature and nature's God.... [Not so Vedanta]. This is the first light that the human mind throws back [of] all that. No satisfaction [comes] of the infinite [in] space. "[The] Self-exisent [One] has [created] the [senses as turned] ... to the outer world. Those therefore who [seek] outside will never find that [which is within]. There are the few who, wanting to know the truth, turn their eyes inward and in their own souls behold the glory [of the Self]"
- Swami Vivekananda
The Soul And God (Delivered in San Francisco, March 23, 1900) - The Complete Works of Swami Vivekananda/Volume 1/Lectures And Discourses/The Soul And God