The use of the word "Discovery" in itself is to be deprecated. For discovery is equivalent to becoming aware of a thing which is already formed; this links up with proof, which no longer bears the character of "discovery" but, in the last instance, of the means that leads to discovery... Discovery is really not a creative act!
In: Alexander Moszkowski - Conversations with Einstein - Chapter V (pp. 94, 95), Horizon Press. 1970