A specific purpose gives one a motivation for a cause, while a central idea gives one the broader picture of how this specific purpose can have a positive or negative impact on society, business, or family.
God symbolizes immortality
by lowering the cost to ship crops to market
People conform to peer pressure because as imperfect humans we don't always make the right decisions so people conform to peer pressure because they may feel left out or accused of not doing what others are doing. Impact? well peer pressure is common and devastating so its like a burned scar emotionally. Me? No due to my age I haven't been in that type of situation but soon I will and I hope I don't give in to pressure.
Because the colonists had to pay taxes, not only that but it was several different taxes that they had to pay