A good aim surveys the ...

A good aim surveys the present state of experience of pupils, and forming a tentative plan of treatment, keeps the plan constantly in view and yet modifies it as conditions develop. The aim, in short, is experimental, and hence constantly growing as it is tested in action.
A good aim surveys the present state of experience of pupils, and forming a tentative plan of treatment, keeps the plan constantly in view and yet modifies it as conditions develop. The aim, in short, is experimental, and hence constantly growing as it is tested in action.

Quotes from the same author

Arriving at one point is the starting point to another.
The self is not something ready-made, but something in continuous formation through choice of action.
Conflict is the gadfly of thought. It stirs us to observation and memory. It instigates to invention. It shocks us out of sheeplike passivity, and sets us at noting and contriving.
Without some goals and some efforts to reach it, no man can live.
Every great advance in science has issued from a new audacity of the imagination.