wear one´s learning lightly

not be self-imporatnt about one´s knowledge, not try impress others

Colleagues also mention his kindness and patience: he
wears his learning lightly, with no hint of arrogance. Google

By any standard, 50 pages of footnotes
impress, though he wears his learning lightly. Google

 He wears his learning lightly, but the book is
peppered with interesting allusions and references.  google

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