How can a God of love call some and not some.

A. Rom 9:18 Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.

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Rom 9:13 As it is written, Jacob have I loved, but Esau have I hated.
Rom 9:14 What shall we say then? Is there unrighteousness with God? God forbid.
Rom 9:15 For he saith to Moses, I will have mercy on whom I will have mercy, and I will have compassion on whom I will have compassion.
Rom 9:16 So then it is not of him that willeth, nor of him that runneth, but of God that sheweth mercy.
Rom 9:17 For the scripture saith unto Pharaoh, Even for this same purpose have I raised thee up, that I might shew my power in thee, and that my name might be declared throughout all the earth.
Rom 9:18 Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.
Rom 9:19 Thou wilt say then unto me, Why doth he yet find fault? For who hath resisted his will?
Rom 9:20 Nay but, O man, who art thou that repliest against God? Shall the thing formed say to him that formed it, Why hast thou made me thus?
Rom 9:21 Hath not the potter power over the clay, of the same lump to make one vessel unto honour, and another unto dishonour?
Rom 9:22 What if God, willing to shew his wrath, and to make his power known, endured with much longsuffering the vessels of wrath fitted to destruction:
Rom 9:23 And that he might make known the riches of his glory on the vessels of mercy, which he had afore prepared unto glory,
Rom 9:24 Even us, whom he hath called, not of the Jews only, but also of the Gentiles?