"Behold thy King" Zech 9:9 : Matthew's perspective of Christ
"Behold My Servant" Isa 42:1 : Mark's perspective of Christ
"Behold the Man" Zech 6:12 : Luke's perspective of Christ
"Behold your God" Isa 40:9 : John's perspective of Christ

Matthew - The Pre-eminence of His Sovereignty
Mark - The Perfection of His Service
Luke - The Purity of His Manhood
John - The Power of His Godhood