Saint Vincent of Lerins

If one yields ground on any single point of Catholic doctrine, one will later have to yield later in another, and again in another, and so on until such surrenders come to be something normal and acceptable. And when one gets used to rejecting dogma bit by bit, the final result will be the repudiation of it altogether.

-- Saint Vincent of Lerins

Saint Nicholas of Tolentino

The heavens are not pure in the sight of Him Whom I serve; how then shall I, a sinful man, stand before Him? 

-- Saint Nicholas of Tolentino

Saint John Cantius

Avoid slander because it is difficult to retract. Avoid offending anyone for to ask forgiveness is not delightful.

-- Saint John Cantius

Saint Margaret of Cortona

My daughter, I see more Pharisees among Christians than there were around Pilate.

-- Saint Margaret of Cortona

Saint Athanasius the Great

You will not see anyone who is really striving after his advancement who is not given to spiritual reading. And as to him who neglects it, the fact will soon be observed by his progress. 

-- Saint Athanasius the Great

Pope St. Gregory the Great

Perhaps it is not after all so difficult for a man to part with his possessions, but it is certainly most difficult for him to part with himself. To renounce what one has is a minor thing; but to renounce what one is, that is asking a lot.

-- Pope St. Gregory the Great

Saint John of Damascus

God created man to be straightforward, but he has entangled himself with an infinity of questions.

-- Saint John of Damascus