According to Karl Marx....

Reason has always existed, but not always in a reasonable form.
The first requisite for the happiness of the people is the abolition of religion.
The rich will do anything for the poor but get off their backs.
If anything is certain, it is that I myself am not a Marxist.
The meaning of peace is the absence of opposition to socialism.
The only antidote to mental suffering is physical pain.
Religion is the opium of the masses.
Capital is dead labor, which, vampire-like, lives only by sucking living labor, and lives the more, the more labor it sucks.

Religion is the impotence of the human mind to deal with occurrences it cannot understand.
The production of too many useful things results in too many useless people.
Workers of the world unite; you have nothing to lose but your chains.
Democracy is the road to socialism.
History repeats itself, first as tragedy, second as farce.
Anyone who knows anything of history knows that great social changes are impossible without feminine upheaval. Social progress can be measured exactly by the social position of the fair sex, the ugly ones included.
From each according to his abilities, to each according to his needs.