From the leaflet:
In the first place, you notice that they all have to do with the travailing love of God in Christ, the passion of God in Christ. Therein lies a mystery — the mystery of the infinite value of the object of His travail. There must be something that justifies it; there must be something of unspeakable preciousness to Him that would lead to this — the travail of His soul. “My soul is exceeding sorrowful even unto death.” “I am jealous for Zion with a great jealousy … I am jealous for her with great wrath.” Because of this tearing of the heart of God to its very depths, something of infinite preciousness and value must be in view.
25 Husbands, love your wives, even as Christ also loved the church, and gave himself for it;
34 And saith unto them, My soul is exceeding sorrowful unto death: tarry ye here, and watch. 35 And he went forward a little, and fell on the ground, and prayed that, if it were possible, the hour might pass from him. 36 And he said, Abba, Father, all things are possible unto thee; take away this cup from me: nevertheless not what I will, but what thou wilt.
1 Again the word of the LORD of hosts came to me, saying, 2 Thus saith the LORD of hosts; I was jealous for Zion with great jealousy, and I was jealous for her with great fury.
14 So the angel that communed with me said unto me, Cry thou, saying, Thus saith the LORD of hosts; I am jealous for Jerusalem and for Zion with a great jealousy.
8 Who hath heard such a thing? who hath seen such things? Shall the earth be made to bring forth in one day? or shall a nation be born at once? for as soon as Zion travailed, she brought forth her children.
10 Yet it pleased the LORD to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the LORD shall prosper in his hand. 11 He shall see of the travail of his soul, and shall be satisfied: by his knowledge shall my righteous servant justify many; for he shall bear their iniquities.