"In the days of his flesh, Jesus offered up prayers and supplications, with loud cries and tears, to him who was able to save him from death, and he was heard because of his reverence. Although he was a son, he learned obedience through what he suffered. And being made perfect, he became the source of eternal salvation to all who obey him,"
It says that through this, Jesus became "perfect." But of course, he was already perfect in his divine personhood, being already very God himself. But in his humanity, his development and accomplishment was not yet complete until he under went his fullest and most difficult test of obedience in the garden and on the cross.
And in the garden, he asked the Father to remove his suffering, though he knew from the beginning that it was his sole purpose for being born. And indeed the Father does answer his request. His Father answered his request with a "No." ....which Jesus accepted.
The Father gave him a "No," which they had already agreed upon from eternity past. But Jesus cries out for mercy to the Father simply as a part of the agony of his human experience of receiving all of God's wrath and anger, a crushing hatred from God toward our evil that was laid upon him, a separation and removal of all forms of God's sustaining kindness, the immensity of which would be unimaginable. Jesus cries out in his willingness not to resist but to receive this suffering, as a Lamb. He went through the agony of feeling the Father's "No" to his plea for mercy, followed by a fierce anger and wrath from God on the cross.
The reason that he received that "No," was so that you and I can be certain and know, without any doubt, that from here on we will always have God's "Yes" from our dear Father in heaven, and always receive his comforting mercy every time we ask. Hallelujah!
With that as our motivation, let us rejoice in this magnificent love we get to relish and enjoy today. In prayer, let us give this day to Jesus and to the Father, and everyday from here on. Amen.