While you cannot deliver policies without principles, you cannot deliver principles without having power. You have quickly to move to a stage where, emphasising your principles, you build a programme, then call for popular support.

Every form of government tends to perish by excess of its basic principle.

In teaching, I wanted to offer a general pharmacology course based on chemical principles, biochemical classification and mathematical modelling. In the event I achieved neither of my ambitions.

If diffraction or interference phenomena were to be sought it was therefore necessary, in accordance with the basic principles of wave theory, to select for the test arrangement far smaller decisive dimensions than those employed in corresponding tests with visible light.

We should be led by principles and morals and not by men.

I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection.

Rules are not necessarily sacred, principles are.

Principles, convictions and motives are neither sold nor bargained for!

Force is the vital principle and immediate parent of despotism.

We must adjust to changing times and still hold to unchanging principles.

As an ideology - and certainly as a political identity - conservatism is less popular than the very principles and values it stands for.

The reason the gifted students of the world like Khan Academy is because we don't say, 'Memorize this formula,' but say, 'Let's try to derive it from core principles,' or, 'I forgot my trig identity, so I'm going to just try to prove this to you.'

It's about the principles, it's about the rule of law. You don't have to stay silent when you see something that you don't like that is inconsistent of these timeless principles.

Conservatives have the advantage of knowing how to debate each other on issues, principles, and priorities, and that is where they should engage Trump.

No one will presumably ever be able to prove or disprove such fundamental religious principles as the existence of God.

Great nations need organizing principles, and 'Don't do stupid stuff' is not an organizing principle.

Infinites, when considered absolutely without any restriction or limitation, are neither equal nor unequal, nor have any certain proportion one to another, and therefore, the principle that all infinites are equal is a precarious one.

When people lack teachers, their tendencies are not corrected; when they do not have ritual and moral principles, then their lawlessness is not controlled.

I ask the members of the Knesset to be very strict about maintaining the principles of democracy.

The very design of neoliberal principles is a direct attack on democracy.