It implies that someone is willing to achieve something either through:
* Reason: Using logic, persuasion, and understanding to convince someone.
* Force: Using physical power, coercion, or intimidation to compel someone.
The phrase suggests that there are two distinct approaches to achieving a goal:
* Reason: A peaceful and cooperative approach.
* Force: A forceful and potentially aggressive approach.
Example:
"Yo obtendré lo que quiero por la razón o fuerza." (I will get what I want by reason or force.)
This statement implies that the speaker will use whatever means necessary, whether it be persuasion or coercion, to achieve their objective.