Rationalist: Reborn or Retarded?

The first six chapters are about MCs past life. It can avoided as it wouldn't have any effect at the beginning of the story.

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In a room that is dimly lit not by an electric bulb but by an esoteric object.

An infant about 6 months old lying in a cradle. Just by looking at him one could see clear traces of confusion in his face.

'What is this?...'

He couldn't understand, as his memories are fuzzy, yet he realizes he knows things that he shouldn't know, things that didn't make sense, thinking in a language that he didn't even know the name of.

In a magical world filled with esoteric flora and fauna where Magus, Weapon wielders and Martial artists reign, it's the story of a boy, Jayce, growing up trying to find a balance between his emotions and hyper-rational thinking he obtained from the 'knowledge' and 'awareness' he inherited as an infant, which forces him to analyze and decide everything in an overly rational manner.