Psychology helps to measure the probability that an aim is attainable.
Colors fade, temples crumble, empires fall, but wise words endure.
Whatever exists at all exists in some amount. To know it thoroughly involves knowing its quantity as well as its quality.
Human folk are as a matter of fact eager to find intelligence in animals.
For origin and development of human faculty we must look to these processes of association in lower animals.
Human beings are accustomed to think of intellect as the power of having and controlling ideas and of ability to learn as synonymous with ability to have ideas. But learning by having ideas is really one of the rare and isolated events in nature.