of philosophy [2]

Indeed, many of the persons known to later times as great philosophers, were, in their own time, persecuted, discriminated, killed, or removed from society. This applies i.a. to Heraclite, Buddha, Socrates, Aristotle, Epicure, Lucretius, Abelard, Bacon, Ockham, Galileo, Descartes, Spinoza, Hume, Rousseau, Marx, Nietzsche, Peirce and Russell, to name some.

The great philosophers have been the creators of the ideas and values many people oriented their lives around, but during their own lives they were generally silent or in trouble, for they dared to say what their contemporaries did not want to hear, to discuss what they did not want to face, and to study and write what very few took interest in or understood.

http://maartens.home.xs4all.nl/philosophy/why_philosophy_is_important.htm 

5. All ideas about philosophy or science, including those that ridicule or condemn philosophy or science, are themselves philosophical ideas, and such as declare all philosophy useless, trifling, or impossible are little better than a refusal to do any serious philosophical or scientific reasoning.
6. The ideas people live and die for, go to war for and kill each other for, or let themselves be inspired to the making of great art or science, are all philosophical ideas.

The lives people lead and the choices they make are the result of the philosophies they hold, whether they are conscious of this fact or not.

http://www.muslimphilosophy.com/ip/rep/H006
.http://www.al-islam.org/al-tawhid/study-philosophy.htm