Ordinary beings view things dualistically: 

as two, not one.

Awakened beings understand 

that all phenomena are one, not two.

Viewing worldly matters and things with a dualistic mind, we view everything as being in opposition, as one or the other, this or that. Thus, we categorize things in opposing terms such as enjoyable or displeasing, superior or inferior, beautiful or repulsive. Discriminating in such a manner, we spend much of our time trying to obtain more of what we desire while strenuously avoiding that which we dislike.

Awakened beings understand that all phenomena are one.

For example, we and another person might view a spoon from opposite sides and argue over whether it is convex or concave. Seeing only our viewpoint, whether it is a spoon or anything else, we argue and can easily end up acting foolishly.

But awakened beings would understand the spoon, etc. is one object with different aspects. Seeing things in their entirety, as one, awakened beings are in accord and proceed together wisely.