The Practicing Stoic by Ward Farnsworth

This book is pure gold, as is the study of Stoicism generally.  Some quotes from the book that hit home:

• "It seems to me that in this whole doctrine about mental disturbances, one thing sums up the matter: that they are all in our power, that they are all taken on as a matter of judgment, that they are all voluntary. This error, then, must be uprooted, this opinion stripped away; and just as things must be made tolerable in circumstances we regard as evil, so too in good ones, those things thought to be great and delightful should be taken more calmly." Cicero, Tusculan Disputations 4.31
• "If Stoics are distinguished by one policy as an everyday matter, it is a refusal to worry about things beyond their control or to otherwise get worked up about them."
• "There is only one road to happiness – let this rule be at hand morning, noon, and night: stay detached from things that are not up to you." Epictetus, Discourses 4.4.39
• "Let us order our minds as if we had come to the end. Let us postpone nothing. Let us balance life’s account every day." Seneca, Epistles 101.7–8
• "In all circumstances, we compare ourselves to what is above us and look to those who are better off. Let us measure ourselves instead by what is below. None are so miserable that they cannot find a thousand examples to provide consolation." Montaigne, On Vanity (1580)
• "Stoics regard the mind as the site and the source of true happiness."
• "Soon you will have forgotten everything; soon everything will have forgotten you." Marcus Aurelius, Meditations 7.21
• "What Cato did when he was struck in the face. He did not get angry, he did not avenge the wrong, he did not even forgive it; he said that no wrong had been done. He showed finer spirit in not acknowledging it than he would if he had pardoned it." Seneca, On the Constancy of the Wise Man 14.3
• "Is a little oil spilled, is a little wine stolen? Say “this is the price of equanimity, this is the price of peace of mind” – for nothing comes free." Epictetus, Enchiridion 12.2
• "If you set a high value on liberty, you must set a low value on everything else." Seneca, Epistles 104.34
• "There is some use in occasionally looking upon terrible misfortunes – such as might happen to us – as though they had actually happened, for then the trivial reverses which subsequently come in reality, are much easier to bear. It is a source of consolation to look back upon those great misfortunes which never happened." Schopenhauer, Our Relation to Ourselves (1851)
• "The advice here given is on a par with a rule recommended by Pythagoras – to review, every night before going to sleep, what we have done during the day. To live at random, in the hurly-burly of business or pleasure, without ever reflecting upon the past – to go on, as it were, pulling cotton off the reel of life – is to have no clear idea of what we are about; and a man who lives in this state will have chaos in his emotions and certain confusion in his thoughts; as is soon manifest by the abrupt and fragmentary character of his conversation, which becomes a kind of mincemeat." Schopenhauer, Our Relation to Ourselves (1851)
• "Students of Stoicism are therefore advised not to do a lot of talking about it. Learning should be shown, not said."
• "Sheep don’t throw up their grass to show the shepherd how much they have eaten; after digesting the grass inside, they bear wool and milk outside. So for you, too: don’t display your learning to the uninstructed: display the actions that result from the digestion of it." Epictetus, Enchiridion 46
• "Stoics are wary of too much attachment to words. They regard progress in philosophy as measured by thought and action, not by a knowledge of precepts."
• "The study of philosophy is not to be postponed until you have leisure; everything else is to be neglected in order that we may attend to philosophy, for no amount of time is long enough for it, even though our lives be prolonged from childhood to the uttermost bounds of time allotted to man." Seneca, Epistles 72.3
• "Stoicism tries to give us what we would gain with more difficulty, but naturally enough, if we had more time."
• "Don’t imagine having things that you don’t have. Rather, pick the best of the things that you do have and think of how much you would want them if you didn’t have them." Marcus Aurelius, Meditations 7.27