From the Teaching of Buddha 

Dharma

Chapter 2 The Theory of Mind Only and the Real State of Things

I Impermanency and Ego-lessness

1 Though both body and mind appear because of cooperating causes, it does not follow that there is an ego-personality. As the body of flesh is an aggregate of elements, it is, therefore, impermanent. 

Chapter 4 Defilements

II Mans Nature

2 There are three kinds of people in the world. The first are those who are like letters carved in rock; they easily give way to anger and retain their angry thoughts for a long time. The second are those who are like letters written in sand; they give way to anger also, but their angry thoughts quickly pass away. The third are those who are like letters written in running water; they do not retain their passing thoughts; they let abuse and uncomfortable gossip pass by unnoticed; their minds are always pure and undisturbed. 

There are three other kinds of people. The first are who are proud, act rashly and are never satisfied; their natures are easy to understand. Then there are those who are courteous and always act after consideration; their natures are hard to understand. Then there are those who have overcome desire completely; it is impossible to understand their natures.