Passion is displayed differently by different men. The pastor of my old church was a pacer, would get into shouting fits, go off on tangents, get on his soap box, etc. A very good teacher and very solid - I learned a great deal from him. He was genuinely passionate and that connected well with the congregation.
My current pastor is much more reserved, never "shouts" and basically never shows emotion. He's almost "professorial," delivering the sermon standing still behind the microphone. But he's far from aloof, and his passion is no less evident - just revealed in his love of the Scripture and the richness of God's Word. More externally subtle, but no less real or convincing.
Member, Redeemer Presbyterian Church (PCA) - though transferring soon to a church in FL
"Come now, and let us reason together," says the Lord, "Though your sins are like scarlet, they shall be as white as snow; though they are red like crimson, they shall be as wool." - Isaiah 1:18