logic

• A slippery slope

  This phrase describes a course of action that, though seemingly innocent, will inevitably lead to a disastrous or undesirable outcome.

• Proof positive

  Undeniable evidence that conclusively demonstrates a fact or conclusion, leaving no room for doubt.

• On the one hand on the other hand

  This phrase is used to introduce and contrast two opposing or different points, opinions, or aspects of a situation.

• black and white

  The phrase describes something that is very clear, unambiguous, and without any shades of gray or complexity.

• You can't have it both ways

  One must choose between two mutually exclusive options or outcomes; it's impossible to enjoy the benefits or avoid the consequences of opposing choices simultaneously.

• Apples and oranges

  Two things that are so fundamentally different that it is illogical or impossible to make a meaningful comparison between them.

• That's comparing apples and oranges

  To compare two things that are fundamentally different and thus cannot be fairly evaluated against each other.

• An unassailable truth

  A fact or principle that is so strong and well-established that it cannot be doubted, attacked, or disproven.

• A given

  Something that is accepted as true or certain to happen, without needing to be proven or discussed.

• A vicious circle

  A problematic situation in which one difficulty leads to another, and that second difficulty then intensifies the first, creating a self-perpetuating and inescapable cycle of misfortune.

• Slippery slope

  A slippery slope describes a course of action that, once begun, is argued to lead inevitably to a series of undesirable consequences.

• On the horns of a dilemma

  To be faced with a difficult choice between two equally undesirable or appealing alternatives, making it hard to decide.

• Essentially

  At its most fundamental or basic level, or in its true nature.

• In the final analysis

  When all factors have been considered and evaluated, this refers to the ultimate conclusion or most important truth.

• Not grounded

  Lacking a practical basis, a realistic understanding of a situation, or a solid foundation in reality.

• Return to first principles

  To go back to the most fundamental truths and assumptions of a subject or problem, rather than reasoning by analogy or previous conclusions.

• The heart of the matter

  The most crucial, central, or essential part of a problem, topic, or situation.