يَتَقَلَّبُ بَيْنَ الْخَوْفِ وَالرَّجَاءِ.
He moves between fear and hope.
Fear and hope are contrasting states. An associative connection through opposition can bring two opposed ideas to the mind together precisely because they differ. Opposition therefore does not always imply disconnectedness; in an appropriate discourse it can itself help establish a meaningful link.
Still, a pair of lexical opposites is not sufficient for every possible coordination. The aims and predications must be considered. Words such as 'good/bad' or 'near/far' do not automatically settle the rhetorical status of their clauses.