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Jaarboek Thomas Instituut 1997 - Thomas Instituut te Utrecht

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34 PIM VALKENBERG<br />

encourage and strengthen the faithful".<br />

In this manner, Aquinas expounds his rules for properly<br />

defending the truth of faith in front of outsiders. He distinguishes<br />

between aspects of this truth that are accessible to human reason, and<br />

aspects that transcend this rational capacity of human beings. In the<br />

first case, rational argumentation plays the main part in defending the<br />

truth of Christian faith. Inthe second case, the major part is played by<br />

arguments from revelation, and human reason has a secondary<br />

function only.<br />

One of the most important consequences of this approach and its<br />

underlining of the role of reasoning as the common ground for<br />

in<strong>te</strong>rreligious communication is that Aquinas sees no possibilities for<br />

proper in<strong>te</strong>rreligious communication with Muslims. In contrast to Jews<br />

and heretics, they are not seen as religious others, with whom<br />

communication about religious mat<strong>te</strong>rs is possible because they partly<br />

accept the same authoritative <strong>te</strong>xts as God's revelation. Because<br />

Aquinas does not accept the Qur'än as authoritative, the<br />

communication remains at the level of world views. Because he did<br />

not live among a Muslim population, but only knew some philosophers<br />

with an Islamic background, he saw the average Muslim primarily as<br />

a philosopher. This is a charac<strong>te</strong>ristic which de<strong>te</strong>rmines the manner of<br />

in<strong>te</strong>rreligious communication with Muslims in medieval Europe<br />

78 Summa contra Gentiles I, cap. 9: "Ad primae igitur ventans<br />

manifestationem per rationes demonstrativas, quibus adversarius convinci<br />

possit, procedendum est. Sed quia tales rationes ad secundam verita<strong>te</strong>m haberi<br />

non possunt, non debet esse ad hoc in<strong>te</strong>ntio ut adversarius rationibus<br />

convincatur: sed ut eius rationes, quas contra verita<strong>te</strong>m habet, solvantur; cum<br />

veritati fidei ratio naturalis eontraria esse non possit, ut os<strong>te</strong>nsum est.<br />

Singularis vero modus convincendi adversarium contra huiusmodi verita<strong>te</strong>m<br />

est ex auctorita<strong>te</strong> Scripturae divinitus confirmata miraculis: quae enim supra<br />

rationem humanam sunt, non credimus nisi Deo revelan<strong>te</strong>. Sunt tarnen ad<br />

huiusmodi verita<strong>te</strong>m manifestandam rationes aliquae verisimiles inducendae,<br />

ad fidelium quidem exercitium et solatium, non au<strong>te</strong>m ad adversarios<br />

convincendos: quia ipsa rationum insufficientia eos magis in suo errore<br />

confirmaret, dum aestimarent nos prop<strong>te</strong>r tam debiles rationes veritati fidei<br />

consentire" (ed. Leonina, vol. xm, p. 22).

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