(idiomatic) To improvise continuously.

One instance of an event (such as the arrival of a single bird) does not necessarily indicate a trend.

(idiomatic) Diversity is essential: the world would be incomplete if everyone were alike; an expression of surprise at a person or people's eccentricity.

To take a decision that will have personally adverse consequences.

Alternative form of one swallow does not a summer make

A person's circumstances are normally the result of their own actions.

Alternative form of one swallow does not a summer make

It is better to mind one's own business than get involved with other people's affairs.

(idiomatic) Something that appears beautiful or good is by definition beautiful or good.

(idiomatic) To produce something refined, admirable, or valuable from something which is unrefined, unpleasant, or of little or no value.