It is never too late to become reasonable and wise.

In the mere concept of one thing it cannot be found any character of its existence.

The greatest human quest is to know what one must do in order to become a human being.

An action is essentially good if the motive of the agent be good, regardless of the consequences.

Reason in a creature is a faculty of widening the rules and purposes of the use of all its powers far beyond natural instinct; it acknowledges no limits to its projects. Reason itself does not work instinctively, but requires trial, practice, and instruction in order gradually to progress from one level of insight to another.

In the kingdom of ends everything has either a price or a dignity. Whatever has a price can be replaced by something else as its equivalent; on the other hand, whatever is above all price, and therefore admits of no equivalent, has a dignity. But that which constitutes the condition under which alone something can be an end in itself does not have mere relative worth, i.e., price, but an intrinsic worth, i.e., a dignity.

The possession of power inevitably spoils the free use of reason.