Saint Thomas Aquinas

Hence we must say that for the knowledge of any truth whatsoever man needs divine help, that the intellect may be moved by God to its act. But he does not need a new light added to his natural light, in order to know the truth in all things, but only in some that surpasses his natural knowledge. 

-- Saint Thomas Aquinas

Saint Cyril of Jerusalem

Since Christ Himself has said, "This is My Body" who shall dare to doubt that It is His Body?

-- Saint Cyril of Jerusalem

Saint Mary Mazarello

Make up your mind to become a saint.

-- Saint Mary Mazarello

Saint Ignatius of Antioch

Mary's virginity and giving birth, and even the Lord's death escaped the notice of the prince of this world; these three mysteries worthy of proclamation were accomplished in God's silence.

-- Saint Ignatius of Antioch

Saint Francis de Sales

Salvation is shown to faith, it is prepared for hope, but it is given only to charity. Faith points out the way to the land of promise as a pillar of fire hope feeds us with its manna of sweetness, but charity actually introduces us into the Promised Land. 

-- Saint Francis de Sales

Saint John the Almoner

If we are able to enter the church day and night and implore God to hear our prayers, how careful we should be to hear and grant the petitions of our neighbor in need. 

-- Saint John the Almoner

Saint Ambrose of Milan

To avoid dissensions we should be ever on our guard, more especially with those who drive us to argue with them, with those who vex and irritate us, and who say things likely to excite us to anger. When we find ourselves in company with quarrelsome, eccentric individuals, people who openly and unblushingly say the most shocking things, difficult to put up with, we should take refuge in silence, and the wisest plan is not to reply to people whose behavior is so preposterous. Those who insult us and treat us contumeliously are anxious for a spiteful and sarcastic reply: the silence we then affect disheartens them, and they cannot avoid showing their vexation; they do all they can to provoke us and to elicit a reply, but the best way to baffle them is to say nothing, refuse to argue with them, and to leave them to chew the cud of their hasty anger. This method of bringing down their pride disarms them, and shows them plainly that we slight and despise them. 

-- Saint Ambrose of Milan