I think, really, the big picture, the true meaning he is trying to show is that, in order for a good idea to form, it needs to have two parts. And at points, you just may not be capable of coming up with both two parts, perhaps one. It is the idea that you must see good ideas. To share your ideas with others, to give them their other half to their good idea, and to get yours. Pretty much sums up a win win. And then it smacks you, how, if you truly need a good idea, you need others. It shows how sharing and giving ideas can be more important
then meets the eye. Not only are you fueling your good idea, you are fueling somebody else, giving them their part. And that just leads to innovation after innovation, if we take the time to really listen to other peoples ideas, and change it to fit yours.
And, if you think this is hard, read it again. Here's another way to put it: Though we all are different, when push comes to shove,our ideas can be made into one, great innovation.