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In philosophy, practical reason is the use of reason to decide how to act. This contrasts with theoretical reason (often called speculative reason), which is the use of reason to decide what to follow.
Necessity drives invention, invention is created via various means, one being laziness as this state can clear the mind giving it room to focus on problem solving. So necessity = mother, invention = child, laziness falls between the mother and child but alongside many other means of enabling inventiveness.