Among those acts which we are free to do or not to do, some are performed in public, others in secret. The former procure us temporal pleasure or advantage, while the latter bring no such reward. In general, prefer what is done in secret without any temporal recompense. You will thus preserve yourself from the snares of self-love, which, as we have already said, insinuates itself into the holiest actions. For this reason a certain man remarkable for his piety was accustomed to say, "Do you know where God is? He is where you are not." By this he meant that where self-interest has not penetrated, there only can God be sought and found.
--Louis de Granada, The Sinner's Guide
