Jamieson, Fausset and Brown on 2 Timothy 1:6

6. Wherefore--Greek, "For which cause," namely, because thou hast inherited, didst once possess, and I trust ("am persuaded") still dost possess, such unfeigned faith [Alford].

stir up--literally, "rekindle," "revive the spark of"; the opposite of "quench" or "extinguish" (1Th 5:19). Paul does not doubt the existence of real faith in Timothy, but he desires it to be put into active exercise. Timothy seems to have become somewhat remiss from being so long without Paul (2Ti 2:22).

gift of God--the spiritual grace received for his ministerial office, either at his original ordination, or at his consecration to the particular office of superintending the Ephesian Church (see on 1Ti 4:14), imparting fearlessness, power, love, and a sound mind (2Ti 1:7).

by the putting on of my hands--In 1Ti 4:14, it is "with [not by] the laying on of the hands of the presbytery." The apostle was chief in the ordination, and to him "BY" is applied. The presbytery were his assistants; so "with," implying merely accompaniment, is said of them. Paul was the instrument in Timothy's ordination and reception of the grace then conferred; the presbyters were the concurrent participants in the act of ordination; so the Greek, "dia" and "meta." So in ordinations by a bishop in our days, he does the principal act; they join in laying on hands with him.