Quote on Perfection from Fulgrim, Horus Heresy.

‘Can it be possible for a thing to be too perfect?’ asked Fulgrim. ‘Surely everything that is beautiful and noble is the product of reason and calculation.’ 
‘Great art isn’t about reason, it’s about what comes from the heart’ said Ostian. ‘You can work with all the technical perfection in the galaxy, but if there is no passion, then it is a wasted effort.’
‘There is such a thing as perfection’, snapped Fulgrim, ‘and our purpose for living is to find that perfection and show it forth. Everything that limits us we have to put aside.’ 
Ostian shook his head , too caught up in his words to notice the primarch’s growing anger. ‘No my lord, for the artist who aims at perfection in everything achieves in it nothing. It is the essence of being human that one does not seek perfection.’
‘And what of your own work?’ asked Fulgrim. ‘Do you not seek perfection in it?’
‘People throw away what they could have by insisting on perfection, which they cannot have, and looking for it where they will never find it. Were I to await perfection, my work would never be finished.’