I see a deeper meaning. I see it in light of relationships.
"Give a man a fire and he's warm for the day."
- I see giving fire as giving someone a pat on the back or praise. They spend the rest of that day happy about their achievement and that they pleased someone else, but the feeling doesn't last that long.
"But set fire to him and he's warm for the rest of his life."
- To set man on fire is to push them to be all that they can be. Give them confidence that they can make their dreams come true. Be their support through the good and bad time of achieving their goals in life.
Overall, I see these two standpoints as how people handle relationships. It is the difference between being husband & wife and partners. Husband & wife will fend for themselves while standing next to each other, but partners will work together to defend and fight for one another.