An ignorant doctor is the aide-de-camp of death.
Avicenna
Now it is established in the sciences that no knowledge is acquired save through the study of its causes and beginnings, if it has had causes and beginnings; nor completed except by knowledge of its accidents and accompanying essentials.
Avicenna
The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.
Avicenna
Du glaubst dich aus dem Nichts und enthältst das Universum.
Avicenna
Laufe in Sandalen, bis daß dir die Weisheit Schuhe einbringt.