Aspire, Inspire and Expire - related meanings?

I saw this on my Facebook feed:

https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash4/1044294_204622203023918_1799367311_n.jpg

A neat little quote for teachers I thought. Then I couldn't help looking at those three spire words and wondering what they had in common in terms of meaning. So off to some of my favourite etymological websites (www.etymonline.com and wordinfo.info) and here's what I found and worked out. 

The root here is spire meaning breathe or breath life into  from the Latin spirare

• aspire - to breathe life upon something- to have hope
• inspire - to breathe or blow into another - in other words, "influence or animate with an idea or purpose" 
• expire - breathe out, especially for the last time (so meaning die or finish) - spelling note: ex means out of but we can't put that before the whole word spire (exspire) because x is never followed by s except across a compound word such as flaxseed)

And here are some more spire words

• conspire - literally breathe together, but means to plot something together
• perspire - to breathe through. The sweat meaning came later but I suppose is about a kind of breathing through the skin.
• respire - this literally means breathe again but I really don't know why it's again. I guess just one breath isn't enough to keep you alive!

The there are all the spirit words that are also related: spirited, spiritual, etc

But, by the way, the word spire itself, meaning a tall pointed tower, comes from a completely different root. It's related to an Old Norse word meaning a slender stalk. 

Love this etymology stuff! Feel free to add your own etymological 'noticings' in the comments.

Johanna