Kierkegaard in a nutshell

is an excellent book edited Robert Van de Weyer (isbn 0-340-69404-1). As usual I'm going to quote from a few pages:
Kierkegaard ... says that most people avoid choice by living 'aesthetically', which broadly means relying on instinct and feelings.
In a provocative passage Kierkegaard suggests that boredom is the root of all evil. He contrasts boredom with idleness.
To Kierkegaard true freedom consists in overcoming constraints, because this involves choice and effort.
He did try to imagine a true 'knight of faith'; and his description is astonishing because the person he portrays is so ordinary... What marks him out is that he takes delight in every scene, every activity and every person. And even if something does not meet his expectations, he enjoys whatever transpires.
His consistent theme, that the source of truth is subjective experience, leaves little room for academic philosophy.
Far from being the root of all evil, idleness is the only true good. Boredom is the root of all evil, and so it must be kept at a distance. Idleness is not evil.
Boredom is overcome through being intensive in your interests, not extensive.
No moment should be regarded as so significant that is cannot be forgotten at your convenience. Equally each moment should have such significance that is can be remembered at will.
When you being to notice that a certain pleasure or experience is gaining too strong a hold on your mind, you should pause and reflect. This will make you want to stop the experience. From the start you should keep every enjoyment under control, never giving yourself totally to it.