Had to borrow this from a fellow atheist online. Sometimes you have to go back to the basics. Liberals need to do this now and then, especially when confronted by a freak like Trump.

Reason

Reason is the capacity for consciously making sense of 

things, applying logic, establishing and verifying facts, 

and changing or justifying practices, institutions, and 

beliefs based on new or existing information. It is closely 

associated with such characteristically human activities 

as philosophy, science, language, mathematics, and art 

and is normally considered to be a definitive 

characteristic of human nature. Reason, or an aspect of 

it, is sometimes referred to as rationality.

Reasoning is associated with thinking, cognition, and 

intellect. Reasoning may be subdivided into forms of 

logical reasoning (forms associated with the strict sense): 

deductive reasoning, inductive reasoning, abductive 

reasoning; and other modes of reasoning considered 

more informal, such as intuitive reasoning and verbal 

reasoning. Along these lines, a distinction is often 

drawn between discursive reason, reason proper, 

and intuitive reason, in which the reasoning process—

however valid—tends toward the personal and the 

opaque. Although in many social and political settings 

logical and intuitive modes of reason may clash, in 

others contexts, intuition and formal reason are seen 

as complementary, rather than adversarial as, for 

example, in mathematics, where intuition is often a 

necessary building block in the creative process of 

achieving the hardest form of reason, a formal proof. 

Reason, like habit or intuition, is one of the ways by 

which thinking comes from one idea to a related idea. 

For example, it is the means by which rational beings 

understand themselves to think about cause and 

effect, truth and falsehood, and what is good or bad. 

It is also closely identified with the ability to self-

consciously change beliefs, attitudes, traditions, and 

institutions, and therefore with the capacity for freedom 

and self-determination.

Reason - Wikipedia