Monism Means a Unitary World-Conception
There may be different aspects and even contrasts, diverse views and opposite standpoints, but there can never be contradiction in truth.
Monism is not a one-substance theory, be it materialistic or spiritualistic or agnostic; it means simply and solely consistency.
All truths form one consistent system, and any dualism of irreconcilable statements indicates that there is a problem to be solved; there must be fault somewhere either in our reasoning or in our knowledge of facts. Science always implies Monism, i. e., a unitary world conception.