Pleonasm

A black darkness is an example of a pleonasm.

Nothing is gained in strength nor precision by this kind of pleonasm.

St. Jerome and St. Augustine are both sparing in the employment of the device of pleonasm.

Indeed, pleonasm, the use of superfluous or redundant words, is only part of the broader features of that style, the expressions of which have been so thoroughly analyzed by Franz Neirynck² and which for convenience will here be referred to as "dualisms."

My salvation is in my Saviour who saveth me hence the redundancy and pleonasm of my asseveration.