The following is a quote from Teresa of Avila in a piece that she writes for her fellow nuns:
I was once considering what the reason was why our Lord loved humility in us so much, when I suddenly remembered that He is essentially the Supreme Truth, and that humility is just our walking in the truth. For it is a very great truth that we have no good in us, but only misery and nothingness, and he who does not understand this walks in lies: but he who understands this the best is the most pleasing to the Supreme Truth. May God grant us this favour, sisters, never to be without the humbling knowledge of ourselves.
Travels from Ur 
Reminded me of a great quote I read in John Stott’s commentary on Romans :
‘Ignorance is the cause of conceit. It is when we have false or fantasy images of ourselves that we grow proud. Conversely, knowledge is conducive to humility, for humility is honesty, not hypocrisy. The complete antidote to pride is truth.’
Of course, one must also differentiate between true knowledge, which humbles, and false knowledge, which puffs up.
from Ezra
Great quote! Thanks Ezra.