Literary help:
Refer to "our brothers". It strikes home about how close we actually are.
Use lists of three to emphasise a point.
Alliteration is also a good way of capturing the listeners attention.
Although repetition is key, it can induce boredom in the listener so keep them space out.
Linked words also work very well.

If you have to speak out:
Don't panic, it will be really easy to tell if you are.
Don't just stare at the sheet, only look down once in a while. Making eye contact is very important
Body language. Keep your arms open. If you put your hands in your pockets or cross your arms, people will realise that you are nervous. Keep gesturing to emphasise particular points. (but as with repetition, do not repeat the same motion)
Talk slightly slower than you usually do and thoroughly pronounce every single syllable. Also, take small gaps in your speech (the tension created can be really good but it also keeps attention) if aren't sure what I mean, reverends in churches talk like it during Bible readings.

I can't think of anything else at the moment.