"To attempt to advise conceited people is like whistling against the wind"

This quote by Thomas Hood is a caution versus attempting to give recommendations to those who believe they know everything. It is a suggestion that it is often a wild-goose chase and energy to attempt and convince someone who is overly confident in their own opinions and capabilities. Hood is suggesting that it is futile to attempt and convince somebody who is conceited, as they are not likely to listen to any advice offered. It resembles trying to whistle versus the wind - the sound will be lost in the breeze and will not be heard. This quote is a reminder to be mindful of when it is worth attempting to provide guidance and when it is better to simply accept that some individuals will not be open to it.