Using these six images as a metaphor, that is to say, you don't want to be a vassal love, nor do you want to be a snobbish campflower, clinging to the high branches of an oak tree and being complacent. Poets don't want to give love, to be a bird that sings for the shade all day, to be a fountain of wishful thinking, and to be a mountain that blindly supports the oak tree. The poet doesn't want to lose himself in such love. Love needs to be based on equality of personality, independence of personality, mutual respect and admiration, and mutual affinity.
The function is metaphor and contrast, highlighting the correct view of love.