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This paper explores the issue of the unification of three languages ofphysics, the geometric language of forces, geometric language of fields or4-dimensional space-time, and probabilistic language of quantum mechanics. Onthe one hand, equations in each language may be derived from the Principle ofLeast Action (PLA). On the other hand, Feynman's path integral method couldexplain the physical meaning of PLA. The axioms of classical and relativisticmechanics can be considered as consequences of Feynman's formulation of quantummechanics.

Probabilistic and Geometric Languages in the Context of the Principle of Least Action