From the pen of Thomas Chalmers, to his friend, Mr. Duncan, a professor of Mathematics, whom he exhorted to become a Christian, written on Sept. 13, 1846:
There is a precise, definite, and let me add, only and exclusive way laid down for the attainment of [eternal life] – a way authoritatively pointed out and prescribed by Heaven. He who hath the Son hath life; he who hath not the Son hath not life. Christ says of Himself, “I am the way, the truth, and the life – by me, if any man enter in, he shall be saved,” and, “No man cometh unto the Father but by the Son.” Let us not quarrel with this way, more especially as it is open to all of us: “Whosoever cometh unto me shall not be cast out,” “Believe in the Lord Jesus Christ and you shall be saved.” It is for God, the offended party, and not for us, the offenders, to dictate the terms and the treaty of reconciliation. Heaven grant that you may be led henceforth to bestow an earnest heed on the Word of His testimony till the day dawn and the day-star arise in your heart.
Letters of Thomas Chalmers, edited by William Hanna, first published 1853, reprinted by The Banner of Truth, 2007, p. 364.