Never think badly of anyone, not even if the words or conduct of the person in question give you good grounds for doing so.
To criticize, to destroy, is not difficult; any unskilled labourer knows how to drive his pick into the noble and finely-hewn stone of a cathedral.
To construct: that is what requires the skill of a master.
Don’t make negative criticism: if you can’t praise, say nothing.
This excerpt is from Josemaría Escrivá’s book The Way.