Abu Hamid al-Ghazālī,
Al-Ghazali letter to Abdul Hassan Mas'ud bin Muhammad bin Ghanam
“ Do not be satisfied with what you have already gained, for it would be unwise to think that being a finite human, you have comprehended the whole range of knowledge which is infinite. "The knowledge the wisest men have shared of Your great power and You is less when compared to Yourself, than one drop of water in an ocean." ”
