“It is man's duty to love and to fear God, even without hope of reward or fear of punishment.”
Source: Guide for the Perplexed (c. 1190), Part III, Ch.24
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Maimónides 180
rabbi, physician, philosopher 1138–1204Related quotes

as quoted in Farid al-Din Attar, Memorial of the Friends of God (c. 1230, 2009 Translation edited by Losensky).

[2005, Stations of Wisdom, World Wisdom, 102, 978-0-94153218-1]
God, Reverential fear and love

“I find in myself by the grace of God a satisfaction without nourishment, a love without fear”