While browsing through my dusty collection of art books, I came across "Picasso on Art- A selection of views" by Dore Ashton.
Christian Zervos, in 1935, put down these remarks of Picasso immediately after a conversation with him. Here's an interesting excerpt,
"A picture is not thought out or settled beforehand. While it is being done it changes as one's thought change. And when it is finished, it still goes on changing, according to the state of mind of whoever is looking at it. A picture lives a life like a living creature, undergoing the changes imposed on us by our life from day to day. This is natural enough, as the picture lives only through the man who is looking at it."