“Though the children did not know Levin well and did not remember when they had last seen him, they did not feel towards him any of that strange shyness and antagonism so often felt by children towards grown-up people who 'pretend,' which causes them to suffer as painfully. Pretence about anything sometimes deceives the wisest and shrewdest man, but, however cunningly it is hidden, a child of the meanest capacity feels it and is repelled by it.”