John Bunyan, in his book Come and Welcome to Jesus Christ, provides some exposition on what Christ means when he says, “I will not cast out” (John 6:37b). Here are eight “particulars” for your encouragement:
(1.) Christ has everlasting life for him that comes to him, and he shall never perish; “For he will in no wise cast him out;” but for the rest, they are rejected, “cast out,” and must be damned (John 10:27-28).
(2.) Christ has everlasting righteousness to clothe them with that come to him, and they shall be covered with it as with a garment, but the rest shall be found in the filthy rags of their own stinking pollutions, and shall be wrapped up in them, as in a winding-sheet, and so bear their shame before the Lord, and also before the angels (Dan 9:27; Isa 57:20; Rev 3:4-18, 15-16).
(3.) Christ has precious blood, that, like an open fountain, stands free for him to wash in, that comes to him for life; “And he will in no wise cast him out;” but they that come not to him are rejected from a share therein, and are left to ireful vengeance for their sins (Zech 13:1; 1 Peter 1:18-19; John 13:8; 3:16).
(4.) Christ has precious promises, and they shall have a share in them that come to him for life; for “he will in no wise cast them out.” But they that come not can have no share in them, because they are true only in him; for in him, and only in him, all the promises are Yea and Amen. Therefore they that come not to him are no whit the better for them (Psa 50:16; 2 Cor 1:20-21).
(5.) Christ has also fullness of grace in himself for them that come to him for life: “And he will in no wise cast them out.” But those that come not unto him are left in their graceless state; and as Christ leaves them, death, hell, and judgment finds them. “Whoso findeth me,” says Christ, “findeth life, and shall obtain favour of the Lord. But he that sinneth against me wrongeth his own soul: all they that hate me love death” (Prov. 8:35-36).
(6.) Christ is an Intercessor, and ever lives to make intercession for them that come to God by him: “But their sorrows shall be multiplied, that hasten after another,” or other gods, their sins and lusts. “Their drink-offerings will I not offer, nor take up their names into his lips” (Psa 16:4; Heb 7:25).
(7.) Christ has wonderful love, bowels, and compassions, for those that come to him; for “he will in no wise cast them out.” But the rest will find him a lion rampant; he will one day tear them all to pieces. “Now consider this,” saith he, “ye that forget God, lest I tear you in pieces, and there be none to deliver” (Psa 50:22).
(8.) Christ is one, by and for whose sake those that come to him have their persons and performances accepted of the Father: “And he will in no wise cast them out;” but the rest must fly to the rocks and mountains for shelter, but all in vain, to hide them from his face and wrath (Rev 6:15-17).
– John Bunyan, Come and Welcome to Jesus Christ (Carlisle, PA: Banner of Truth, 2004), 116-18.