Spurgeon writes in Lectures to My Students:

Just as the earth is not the centre of the universe, so man is not the grandest of all beings. God has been pleased highly to exalt man; but we must remember how the psalmist speaks of him: “When I consider thy heavens, the work of thy fingers, the moon and the stars, which thou hast ordained; what is man, that thou art mindful of him; and the son of man, that thou visitest him?” In another place, David says, “Lord, what is man, that thou takest knowledge of him! or the son of man, that thou makest account of him! Man is like to vanity: his days are as a shadow that passeth away.” Man cannot be the centre of the theological universe, he is altogether too insignificant a being to occupy such a position, and the scheme of redemption must exist for some other end than that of merely making man happy, or even of making him holy. The salvation of man must surely be first of all for the glory of God; and you have discovered the right form of Christian doctrine when you have found the system that has God in the centre, ruling and controlling according to the good pleasure of his will. Do not dwarf man so as to make it appear that God has no care for him; for if you do that, you slander God. Give to man the position that God has assigned to him; by doing so, you will have a system of theology in which all the truths of revelation and experience will move in glorious order and harmony around the great central orb, the Divine Sovereign Ruler of the universe, God over all, blessed for ever.

C.H. Spurgeon on the importance of earnestness in preaching:

Brethren, you and I must, as preachers, be always earnest in reference to our pulpit work. Here we must labor to attain the very highest degree of excellence. Often have I said to my brethren that the pulpit is the Thermopile of Christendom: there the fight will be lost or won. To us ministers the maintenance of our power in the pulpit should be our great concern, we must occupy that spiritual watch-tower with our hearts and minds awake and in full vigor. It will not avail us to be laborious pastors if we are not earnest preachers. We shall be forgiven a great many sins in the matter of pastoral visitation if the people’s souls are really fed on the Sabbath-day; but fed they must be, and nothing else will make up for it. The failures of most ministers who drift down the stream may be traced to inefficiency in the pulpit.