None can less afford to delay than the aged sinner. Now is the time. Now or never. You have, as it were, one foot already in the grave. Your opportunities will soon be over. Strive, then, I entreat you, to enter in at the strait gate.

By the time he was 21 Alexander was a preacher of the Presbyterian Church. Charles Hodge a famous student and successor of Alexander named his son Archibald Alexander Hodge after his mentor. Family
On April 5 1802 Alexander married Janetta Waddel the daughter of a Presbyterian preacher James Waddel (1739–1805) whose eloquence was described in William Wirt's Letters of a British Spy (1803).

Archibald Alexander (April 17 1772 – October 22 1851) was an American Presbyterian theologian and professor at the Princeton Theological Seminary.