It is self-evident that any and all paths must be open to a researcher during the actual course of his [or her] investigations.
![It is self-evident that any and all paths must be open to a researcher during the actual course of his [or her] investigations.](http://cdn.quoteddaily.com/images/karl-weierstrass/it-is-self-evident-that-any-and-all-paths-must-be-open-to-a-researcher-during-the-actual-course-of.jpg)
It is self-evident that any and all paths must be open to a researcher during the actual course of his [or her] investigations.