Our Sympathetic Saviour

The heart and mind and will of our Lord has been moulded - shall we not say forged? - in the furnace of temptation and suffering. And it was in virtue of what he had learned in that experience of temptation and suffering that he was able, at the climactic point fixed by the arrangements of infallible wisdom and everlasting love, to be obedient unto death, even the death on a cross. It was only as having learned obedience in the path of inerrant and sinless discharge of the Father's will that his heart and mind and will were framed to the point of being able freely and voluntarily to yield up his life in death upon the accursed tree." 

John Murray, Redemption: Accomplished and Applied

Murray beautifully points out in explaining Hebrews 2:10-18 and 5:8-10, that as Jesus walked this earth in obedience to His father, withstanding temptations, He became more aware of in fact why He was called to die. In other words, when He saw our sinful state first hand, He embraced the call to the cross.
As Jesus walked this earth, He saw the temptations and suffering we face and the many sins we fall into and it was His perfect obedience in the midst of this that made Him the "all-sufficient and perfect Saviour."