Over all, so exquisite is the workmanship that it is said - “having been designed by the giants and finished by jewelers“.

Emperor Shah Jahan himself described the Taj in these words:

Should guilty seek asylum here,
Like one pardoned, he becomes free from sin.
Should a sinner make his way to this mansion,
All his past sins are to be washed away.
The sight of this mansion creates sorrowing sighs,
And the sun and the moon shed tears from their eyes.
In this world this edifice has been made,
To display thereby the creator's glory!

Source: http://bit.ly/Ss344o