Said of a person who has potential that is never fulfilled.

Alternative form of always a bridesmaid, never a bride

People often fail to apply their skills to themselves.

Alternative form of trust everybody, but cut the cards

Alternative form of trust everybody, but cut the cards

Alternative form of the darkest hour is just before the dawn

Poverty for some is inevitable.

Alternative form of a bad penny always turns up

Alternative form of a bad penny always turns up

A person or thing which is unpleasant, dishonorable, or unwanted tends to appear (or reappear), especially at inopportune times. / Things that are done improperly eventually cause problems.