I have a question regarding the usage of "ultimately" in the passage below, quoted from an article here:
The reports about Thales show him employing a certain kind of explanation: ultimately the explanation of why things are as they are is grounded in water as the basic stuff of the universe and the changes that it undergoes through its own inherent nature.
According to the Cambridge online dictionary, it is an adverb and has two usages:
1: It is used to denote the meaning of "finally, in the end" 2: and used to denote the most important part of something.
Does it, in the passage above, mean that the gist and summary of his explanation is what follows or it may have some more profound explanation in this context?