Here are some great thoughts by C.S. Lewis about virtue and vice.
"Ambition! We must be careful what we mean by it. If it means the desire to get ahead of other people--which is what I think it does mean--then it is bad. If it means simply wanting to do a thing well, then it is good (p. 1)."
"I do not believe one can settle how much we ought to give. I am afraid the only safe rule is to give more than we can spare (p. 4)."
"Sometimes our pride also hinders our charity; we are tempted to spend more than we ought on the showy forms of generosity...and less than we ought on those who really need our help (p. 5)."
"'God is easy to please, but hard to satisfy (p. 7).'"
"Courage is not simply one of the virtues, but the form of every virtue at the testing point (p. 9)."
"You cannot be kind unless you have all the other virtues (p. 9)."
"Despair is a greater sin than any of the sins which provoke it (p. 10)."
"Your real, new self...will not come as long as you are looking for it. It will come when you are looking for Him (p. 11)."
"You will never make a good impression on other people until you stop thinking about what sort of impression you are making... Lose your life and your will save it. Submit to death, death of your ambitions and favourite wishes every day and death of your whole body in the end: submit with every fibre of your being, and you will find eternal life (p. 12)."
"Look for Christ and you will find Him, and with Him everything else thrown in (p. 13)."
"Faith in Christ is the only thing to save you from despair (p. 17)."
"'Forgive us our trespasses as we forgive those that trespass against us.' We are offered forgiveness on no other terms. To refuse it is to refuse God's mercy for ourselves. There is no hint of exceptions and God means what He says (p. 20)."
"I find that when I think I am asking God to forgive me I am often in reality...asking Him to do something quite different. I am asking Him not to forgive me but to excuse me (p. 21)."
"The happiness that God designs for His higher creatures is the happiness of being freely, voluntarily united to Him and to each other in an ecstasy of love and delight (p. 25)."
"Never, in peace or war, commit your virtue or your happiness to the future. Happy work is best done by the man who takes his long-term plans somewhat lightly and works from moment to moment 'as to the Lord.' It is only our daily bread that we are encouraged to ask for. The present is the only time in which any duty can be done or any grace received (p. 25)."
"There are only two kinds of people in the end: those who say to God, 'Thy will be done,' and those to whom God says, in the end, 'Thy will be done (p. 32).'"
"Aim at Heaven and you will get earth 'thrown in': aim at earth and you will get neither (p. 33)."
"He wants you to know Him: wants to give you Himself (p. 35)."
"Knowledge can last, principles can last, habits can last; but feelings come and go (p. 47)."
"'God wants to give us something, but cannot, because our hands are full--there's nowhere for Him to put it (p. 57).'"
"Each time you fall He will pick you up again. And He knows perfectly well that your own efforts are never going to bring you anywhere near perfection (p. 59)."
"Pride leads to every other vice: it is the complete anti-God state of mind (p. 65)."
"Pride gets no pleasure out of having something, only out of having more of it than the next man... Once the element of competition has gone, pride has gone (p. 66)."
"A man is never so proud as when striking an attitude of humility (p. 67)."
"If you are on the wrong road, progress means doing an about-turn and walking back to the right road (p. 68)."
"God will not love you any the less, or have less use for you, if you happen to have been born with a very second-rate brain. He has room for people with very little sense, but He wants every one to use what sense they have (p. 70)."
"We never find out the strength of the evil impulse inside us until we try to fight it: and Christ, because He was the only man who never yielded to temptation, is also the only man who knows to the full what temptation means--the only complete realist (p. 87)."
"Imagine yourself as a living house. God comes in to rebuild that house. At first, perhaps, you can understand what He is doing. He is getting the drains right and stopping the leaks in the roof and so on: you knew that those jobs needed doing and so you are not surprised. But presently he starts knocking the house about in a way that hurts abominably and does not seem to make sense. What on earth is He up to? The explanation is that He is building quite a different house from the one you thought of--throwing out a new wing here, putting on an extra floor there, running up towers, making courtyards. You thought you were going to be made into a decent little cottage: but He is building a palace. He intends to come and live in it Himself (p. 88)."
"All these toys were never intended to possess my heart...my true good is in another world and my only real treasure is Christ (p. 90)."