And the Lord came, and stood, and called as at other times, Samuel, Samuel! iii. Sam.
Of urgency he stood, and called. Mark how He stands at the door to knock. At first He was content to call the lad once by name; but after three unsuccessful attempts to attract him to Himself, He uttered the name twice, with strong urgency in the appeal, Samuel! Samuel! This has been called God's double knock. There are seven or eight of these double knocks in Scripture: Simon, Simon; Saul, Saul; Abraham, Abraham.
How may we be sure of a Divine call?
We may know God's call when it grows in intensity. ‑‑ If an impression comes into your soul, and you are not quite sure of its origin, pray over it; above all, act on it so far as possible, follow in the direction in which it leads ‑‑ and as you lift up your soul before God, it will wax or wane. If it wanes at all, abandon it. If it waxes follow it, though all hell attempt to stay you.
We may test God's call by the assistance of godly friends. ‑‑ The aged Eli perceived that the Lord had called the child, and gave him good advice as to the manner in which he should respond to it. Our special gifts and the drift of our circumstances will also assuredly concur in one of God's calls.
We may test God's call by its effect on us.‑‑ Does it lead to self‑denial? Does it induce us to leave the comfortable bed and step into the cold? Does it drive us forth to minister to others? Does it make us more unseIfish, loving, tender, modest, humble! Whatever is to the humbling of our pride, and the glory of God, may be truly deemed God's call. Be quick to respond, and fearlessly deliver the message the Lord has given you.
~F. B. Meyer~