First of all, principles should be general. That is, it must be possible to formulate them without use of what would be intuitively recognized as proper names, or rigged definite descriptions.

In all sectors of society there should be roughly equal prospects of culture and achievement for everyone similarly motivated and endowed. The expectations of those with the same abilities and aspirations should not be affected by their social class.

Ideally a just constitution would be a just procedure arranged to insure a just outcome.

[E]ach person is to have an equal right to the most extensive basic liberty compatible with a similar liberty for others.

Justice is the first virtue of social institutions.

Justice is happiness according to virtue.

The claims of existing social arrangements and of self interest have been duly allowed for. We cannot at the end count them a second time because we do not like the result.