"You never know how a horse will pull until you hook him to a heavy load"

This quote by Paul Bryant is a metaphor for life. It recommends that you never know how somebody will respond to a difficult situation until they are put in it. It indicates that people can surprise you with their strength and durability when confronted with a difficulty. It also implies that it is important to provide people the chance to prove themselves, even if they might not seem as much as the job. The quote motivates us to believe others and to provide the possibility to reveal what they can. It is a tip that we ought to not judge people based on their appearance or past experiences, however rather provide the chance to reveal us what they can do.