That moment you're dancing closely with someone, sharing weight and momentum, trusting and being trusted, it doesn't matter who they are: you love them, love their physical existence in this world.
But while that's going on, it should be possible to build momentum and trust by working on corporate tax reform, individual tax reform, Social Security reform and other things.
And when you have a sense of momentum and trust?
But the contradictions – some of them substantial – hardly matter, for the SNP possesses both momentum and the trust of a large chunk of the Scottish electorate.
Our civic momentum is to trust the famous checks and balances and resist any notion of a new era that will require a new kind of response.
Admitting that his government is at "a fork in the road" - tempted to rest on its laurels - the prime minister used a series of public exchanges in Bristol and Newport to tell his supporters that "this is the time for the party to take risks" as it seeks to restore ministerial momentum and voter trust.
Bratt and Treharne agree that there are significant challenges on the horizon, not least the development of St James Park but also keeping the momentum of the trust going.
The idea is to remain invested in any fund trending upwards until it goes into reverse, at which point you sell your units and reinvest in the next momentum-driven unit trust.
Last week's compromise, on this view, was a step towards building the trust and momentum needed for netting bigger fish, particularly a Doha agreement, through Congress.
But until there is evidence that the fundamental thinking about housing has shifted in an optimistic direction, we cannot trust that momentum to continue.
