How are montesquieu's ideas still in use today?

Liberty

Liberty consists principally in not being forced…Countries are well cultivated, not as they are fertile, but as they are free…when there is no abuse of power…In a country of liberty, every man who is supposed a free agent ought to be his own governor…The liberty of one citizen is of greater importance to the public than the ease or prosperity of another…The real wants of the people ought never to give way to the imaginary wants of the state.

Property

When the inhabitants of a state are all free subjects…each man enjoys his property with as much right as the prince…The public good consists in every one’s having his property…invariably preserved… Each citizen contributes to the revenues of the State a portion of his property in order that his tenure of the rest may be secure…Whenever the public good happens to be the matter in question, it is not for the advantage of the public to deprive an individual of his property, or even to retrench the least part of it by a law, or a political regulation.

Trade

Trade produces…exact justice, opposite to robbery…[it] renders every man willing to live on his own property…When a democracy is founded on commerce, private people may acquire vast riches without corruption of morals…It is much better to leave trade open than…to restrain the liberty of commerce…[it] flies from the places where it is oppressed, and stays where it has liberty to breathe.

Government

In an extensive republic…there are trusts too considerable to be placed in any single subject; he has interests of his own; he soon begins to think that he may be happy and glorious, by oppressing his fellow-citizens…But we cannot give someone else greater power over us than we have ourselves…There is no crueler tyranny than that which is perpetuated under the shield of law and in the name of justice… Experience shows us that every man invested with power is apt to abuse it, and to carry his authority as far as it will go…To prevent this abuse, it is necessary from the very nature of things that power should be a check to power.