Duties of the Heart, Fifth Treatise on Devotion
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אֲבָל מָה הוּא יִחוּד הַמַּעֲשֶׂה לֵאלֹהִים, הוּא הַכַּוָּנָה בַּנִּרְאֶה וּבַנִּסְתָּר בְּמַעֲשֵׂה עֲבוֹדַת הָאֱלֹהִים לִשְׁמוֹ לְהַגִּיעַ אֶל רְצוֹנוֹ בִּלְבַד מִבִּלְתִּי רְצוֹן הַבְּרוּאִים:
Duties of the Heart, trans. Rabbi Yosef Sebag
What is devotion of actions to G-d? It is the intent in all revealed or hidden acts in the service of G-d, to do them for His Name. To attain His favor only and not to do them to win the favor of other people.