Duties of the Heart, Fourth Treatise on Trust
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אַךְ מַהוּת הַבִּטָּחוֹן הִיא מְנוּחַת נֶפֶשׁ הַבּוֹטֵחַ וְשֶׁיִּהְיֶה לִבּוֹ סָמוּךְ עַל מִי שֶׁבָּטַח עָלָיו שֶׁיַּעֲשֶׂה הַטּוֹב וְהַנָּכוֹן לוֹ בָּעִנְיָן אֲשֶׁר יִבְטַח עָלָיו כְּפִי יְכָלְתּוֹ וְדַעְתּוֹ בְּמָה שֶׁמֵּפִיק טוֹבָתוֹ.
Trust is peace of mind of the one who trusts. That one relies in his heart that the one he trusts in will do what is good and proper for him on the matter he has trusted him with, according to his ability and his understanding of what will further his good.
אֲבָל הָעִקָּר אֲשֶׁר בַּעֲבוּרוֹ יִהְיֶה הַבִּטָּחוֹן מִן הַבּוֹטֵחַ וְאִם יִפָּקֵד לֹא יִמָּצֵא הַבִּטָּחוֹן הוּא שֶׁיִּהְיֶה לִבּוֹ בָּטוּחַ בְּמִי שֶׁיִּבְטַח בּוֹ שֶׁיְּקַיֵּם מָה שֶׁאָמַר וְיַעֲשֶׂה מָה שֶׁעָרַב וְיַחְשֹׁב עָלָיו הַטּוֹב בְּמָה שֶׁלֹּא הִתְנָה לוֹ וְלֹא עָרַב עֲשֹׂהוּ שֶׁיַּעֲשֵׂהוּ נְדָבָה וָחֶסֶד.
But the main factor, which leads one to trust in the one trusted, and without which trust cannot exist, is for one's heart to be confident that the one trusted will keep his word and will do what he pledged, and that he will also think to do what is good for him even on what he did not pledge out of pure generosity and kindness (this will be explained).