philosophy any personal belief about how to live or how to deal with a situation; "self-indulgence was his only philosophy"; "my father's philosophy of child-rearing was to let mother do it"
rationalism -
the theological doctrine that human reason rather than divine revelation establishes religious truth
and in its modern sense, rationalism is "any view appealing to reason as a source of knowledge or justification" (Lacey 286). In more technical terms it is a method or a theory "in which the criterion of the truth is not sensory but intellectual and deductive" (Bourke 263). Different degrees of emphasis on this method or theory lead to a range of rationalist standpoints, from the moderate position "that reason has precedence over other ways of acquiring knowledge" to the more extreme position that reason is "the unique path to knowledge" (Audi 771).
OmegaWiki Dictionary
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rationalism A philosophical approach that argues that human behavior can be best understood by the application of reason, logic, and common sense.