The Nietzschean no and yes are applicable in many other places also. We can't know what it means to be for or against something until we also understand the position opposite that "something", to formulate our no required for our yes.
That can be difficult as Nietzsche found out, because a huge part of the organism's biology and psychology are tied into values-declarations almost automatically, so that positive or negative connotations of need or feeling or expectation appear in almost everything. Thus there exists for these positions invisible "no" conditions that cannot easily be seen. Philosophy is daemonic because we must push past values and feelings and needs in order to arrive at a middle-point where both the object itself and its most perfect opposition are brought together in a single moment of consciousness, because only by doing so can we truly cause both polarized ideas to influence each other.
The forced position that compels no and yes to encounter each other authentically, and we will always know if the encounter is authentic because it will be radically new to us, the force of the insight and feeling that comes out of the clash. If the encounter is mundane and fits within established expectations and feelings- or values-parameters then the encounter wasn't complete or original, but merely a kind of re-configuration of existing perspectives.
“Be clever, Ariadne! ...
You have little ears; you have my ears:
Put a clever word in them! —
Must one not first hate oneself, in order to love oneself? ...
I am your labyrinth ...”. -N
“A man is not great if he is not small, and he is not small if he is not great. Concepts flirt with the loss of their significance in the oscillation between ambiguous states, and this is in part the function and purpose of concepts.” -Primer on Meaning