STATING
THAT THE ROAD TO FELICITY IS KNOWLEDGE AND ACTION
(p. 194)
If you say: "It is clear to me that treading the path of felicity is the determination of the intelligent (folk) and its neglect is the heedlessness of the ignorant.
How could someone travel this road without any knowledge of it?
How could I know that knowledge and action are the path [to felicity] in order to tread upon it?"
You have two ways of knowing it:
First, one that is agreeable to the prior methodology, and it is that you should consider what the three groups agreed upon.
Indeed they were united in [the belief] that success and salvation will not be achieved save by knowledge and action together.
They have agreed that knowledge is nobler than action. It is as though action is its achievement. Knowledge steers action to arrive at its destination.
Allah, the Most High, states:
{To Him pious speech rises, And the righteous action advances it higher}
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http://www.ghazali.org/works/mizan-en2.htm