Within this limit and to the extent of the interest of the Government involved it would seem both expedient and proper if an economical and practicable route shall be found to aid by all constitutional means in the construction of a road which will unite by speedy transit the populations of the Pacific and Atlantic States. To guard against misconception, it should be remarked that although the power to construct or aid in the construction of a road within the limits of a Territory is not embarrassed by that question of jurisdiction which would arise within the limits of a State, it is, nevertheless, held to be of doubtful power and more than doubtful propriety, even within the limits of a Territory, for the General Government to undertake to administer the affairs of a railroad, a canal, or other similar construction, and therefore that its connection with a work of this character should be incidental rather than primary. I will only add at present that, fully appreciating the magnitude of the subject and solicitous that the Atlantic and Pacific shores of the Republic may be bound together by inseparable ties of common interest, as well as of common fealty and attachment to the Union, I shall be disposed, so far as my own action is concerned, to follow the lights of the Constitution as expounded and illustrated by those whose opinions and expositions constitute the standard of my political faith in regard to the powers of the Federal Government. It is, I trust, not necessary to say that no grandeur of enterprise and no present urgent inducement promising popular favor will lead me to disregard those lights or to depart from that path which experience has proved to be safe, and which is now radiant with the glow of prosperity and legitimate constitutional progress. We can afford to wait, but we can not afford to overlook the ark of our security.