The Scriptures, therefore, in the most explicit terms teach that the external call of the gospel is addressed to all men. The command of Christ to his Church was to preach the gospel to every creature. Not to irrational creatures, and not to fallen angels these two classes are excluded by the nature and design of the gospel. Further than this there is no limitation, so far as the present state of existence is concerned. We are commanded to make the offer of salvation through Jesus to every human being on the face of the earth. We have no right to exclude any man; and no man has any right to exclude himself. God so loved the world, that He gave his only begotten Son, that whosoever believeth in Him might not perish but have everlasting life. The prediction and promise in Joel ii. 32, “Whosoever shall call on the name of the LORD shall be delivered,” is repeatedly renewed in the New Testament, as in Acts ii. 21; Romans x. 13. David says (Psalm lxxxvi. 5), “Thou, Lord, art good, and ready to forgive; and plenteous in mercy unto all them that call upon thee.” 

 Charles Hodge, Systematic Theology,  2: 642-643.