God gives sufficient grace to enable sinners to respond positively to Him and extends His offer of salvation to all.
Mat 5:44-45 But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you; (45) That you may be the children of your Father which is in heaven: for he makes his sun to rise on the evil and on the good, and sends rain on the just and on the unjust.
Act 17:24-27 God that made the world and all things therein, seeing that he is Lord of heaven and earth, dwells not in temples made with hands; (25) Neither is worshipped with men's hands, as though he needed any thing, seeing he gives to all life, and breath, and all things; (26) And has made of one blood all nations of men for to dwell on all the face of the earth, and has determined the times before appointed, and the bounds of their habitation; (27) That they should seek the Lord, if haply they might feel after him, and find him, though he be not far from every one of us:
God gives efficient grace to effect regeneration in all those who have no will or desire to resist His calling them, meaning His efficient grace is irresistible to those whom the Holy Spirit is able quicken.
Joh 6:35-40 And Jesus said unto them, I am the bread of life: he that comes to me shall never hunger; and he that believes on me shall never thirst. (36) But I said unto you, That you also have seen me, and believe not. (37) All that the Father gives me shall come to me; and him that comes to me I will in no wise cast out. (38) For I came down from heaven, not to do mine own will, but the will of him that sent me. (39) And this is the Father's will which has sent me, that of all which he has given me I should lose nothing, but should raise it up again at the last day. (40) And this is the will of him that sent me, that every one which sees the Son, and believes on him, may have everlasting life: and I will raise him up at the last day.