his reach never exceeds his grasp
Hey guys,

I need some tips to comprehend better this sentence: his reach never exceeds his grasp. I've read it in a review on the British historian Tim Blanning's new book called The Romantic Revolution: A History.

If you need more context, here they are: The book is a bit of a whirlwind tour, but those seeking a brief, nuanced overview of the movement will find in Blanning a knowledgeable guide—deft and incisive, but never facile. And although his goal is breadth, not depth, of coverage, his reach never exceeds his grasp.

http://www.weeklystandard.com/author/peter-lopatin

Many thanks in advance!

Question

his reach never exceeds his grasp
Hey guys,

I need some tips to comprehend better this sentence: his reach never exceeds his grasp. I've read it in a review on the British historian Tim Blanning's new book called The Romantic Revolution: A History. 

If you need more context, here they are: The book is a bit of a whirlwind tour, but those seeking a brief, nuanced overview of the movement will find in Blanning a knowledgeable guide—deft and incisive, but never facile. And although his goal is breadth, not depth, of coverage, his reach never exceeds his grasp.

http://www.weeklystandard.com/author/peter-lopatin

Many thanks in advance!

Answer

This means when he tries to do something he always succeeds.  He reaches for a goal and he is able to grasp it.  He does not reach for a goal, then fails to grasp it.

Answer

His grasp is what he grasps with his understanding. If something is beyond (exceeds) his understanding he doesn't talk about it. This is what makes him extremely good.