Personal Development through Thinking

The only real use of quotes such as these - because they are taken out of context - is to intitate a thinking process in regard to your own circumstances. If you read one and it strikes a chord it may be that it loosely reflects your own circumstances. Perhaps it can help you to start thinking about your life in a different way. I hope you enjoy them. 
 

Life is very short and anxious for those who forget the past, neglect the present, and fear the future. (Seneca 26)
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Happiness depends on Wisdom (Sophocles)
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The greatest obstacle to living is expectancy, which hangs upon tomorrow and loses today.(Seneca 13)
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All of us are creatures of a day: the rememberer and the remembered alike. (Marcus Aurelius 38)
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Of pleasures those which occur most rarely give the greatest delight. (Epictetus 35)
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When the soul is without a definite aim she gets lost; for, as they say, if you are everywhere you are nowhere. (Michel de Montaigne 69)
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One should bring this question to bear on all one’s desires: what will happen to me if what is sought by desire is achieved, and what will happen if it is not?(Epicurus 40)
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Sensuality often forces the growth of love too much, so that its root remains weak, and is easily torn up.(Friedrich Nietzsche 50)
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Devotion is a love of one whom we wonder at. (Benedict De Spinoza 106)
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Thinking has to be kindled, as a fire is by a draught, and kept going by some kind of interest in its object, which may be an objective interest or merely a subjective one (Arthur Schopenhauer 68)
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Co-existence must in all cases be experienced on both sides. If neither of us is a constituting consciousness at the moment when we are about to communicate and discover a common world, the question then is: who communicates, and for whom does this world exist? (Maurice Merleau-Ponty 416)
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The usefulness of an opinion is itself matter of opinion - as disputable, as open to discussion, and requiring disussion as much as the opinion itself. (John Stuart Mill 82)
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[Understanding is] when you understand something, to recognize that you understand it; but when you do not understand something, to recognize that you do not understand it - that’s understanding. (Confucius 7)
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Insofar as it is possible, everything should be doubted once in a lifetime by whoever is searching for the truth (René Descartes 112)
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There are no misunderstandings in nature; they are only to be found in the realms man calls “understanding” (Carl Gustav Jung 121)
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The good, then, is the end of all endeavour, the object on which every heart is set, whose existence it divines, though it finds it difficult to grasp just what it is: and because it can’t handle it with the same assurance as other things it misses any value those other things have. (Plato 243)
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By not venturing [speaking out] it is so dreadfully easy to lose what would be hard to lose by venturing and which, whatever you lost, you will in any case never lose in this way, so easily, so completely, as if it were nothing - oneself. (Soren Kierkegaard, 64)
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Each rational being should treat him or herself and all others, never merely as a means, but always at the same time as an end in him or herself. (Immanuel Kant, 122) 
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Anger, by reason of its natural heat and quickness, listening to Reason, but without having heard the command of Reason, rushes to its revenge. (Aristotle, 124)
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I will add more very soon …