WordSense and functionاللُّبَانَةA desired aim or needأَقْضِيI fulfil; first-person imperfect verbأُفَرِّطI neglect or let slip; form IIرِيبَةApprehension, doubt or fear of censure
Lā ufarrīṭu conveys more than merely ‘not quitting.’ It suggests not allowing time, courage or opportunity to be squandered, contrasting neglect with the poet’s declared resolve.