Passion

Work and play, hiding and seeking, dark and light are they opposites?
Work can be turned into play, or play into work, by the approach taken; so many otherwise onerous tasks can be fun if turned into a game. 
Hiding an object requires that one must first have sought the object to hide, so that in turn, others may seek and hopefully find; one of my children’s favourite games used to be 'Hunt the Frog', but before they could hunt the little, plastic frogs, my husband had to find innovative places to hide them, and that was only after he located where he had put them away to previously!
As for dark and light: my book “Plimgar to Luminar: Samuel’s Quest” is chiefly about light and dark, and sometimes it seems that they must be opposites. However, in terms of words the answer may be ‘yes’, but in terms of reality, the answer is ‘no’. Light is a ‘something’ dark is a ‘nothing’. Dark is only an absence of light, in other words: darkness only exists where light is absent, or of low intensity, the converse is certainly not true...more darkness cannot “drown out” light since dark has no substance or density.
I remember as a small child being told by my parents that love and hate are not opposites but siblings, passion and indifference being the true opposites. I’m not sure I agree that love and hate are so closely aligned, but I definitely agree that the opposite of passion is indifference.  Much of life’s richness is contributed by passion and passion is closely aligned to creativity.
It is a truism that in finding the things we are good at and enjoy, and working at those areas of “passion”, we are most likely to succeed. Being creative and passionate about the task at hand not only renders the task more enjoyable, but also feeds the energy required for the task and ultimately the result.