One of the most important skills of the economist, therefore, is that of simplification of the model. Two important methods of simplification have been developed by economists. One is the method of partial equilibrium analysis (or microeconomics), generally associated with the name of Alfred Marshall and the other is the method of aggregation (or macro-economics), associated with the name of John Maynard Keynes.

The use of isoquants to describe the production function did not develop to any great extent until the thirties.

Humble, honest, ignorance is one of the finest flowers of the human spirit

[Peace praxis is] a peace process that deals with conflict integratively.

Theories without facts may be barren, but facts without theories are meaningless.

What exists, is possible.

There is a quiet, open place in the depths of the mind, to which we can go many times in the day and lift up our soul in praise, thankfulness and conscious unity. With practise this God-ward turn of the mind becomes an almost constant direction, underlying all our other activities.