The work you return to is not merely your own, but the work of the Lord He works through you. Look not to your own strength, your years of experience, or even the peace you gathered in your vacation. These things are fleeting. But say to yourself, “The commands laid upon me, the souls placed before me, this is the work of the Lord.” This serves you instead of all nobility and wisdom.
Yet I must also rouse you, lest hearing that the work is accomplished not by your own power but by grace, you become idle. Do not treat this grace as a license for carelessness. You ask for help to do a good job. That is a fitting prayer, but the fruit of that prayer must be your own diligent labor. Prove your own work, and then you shall have rejoicing in yourself, not in the comfort of a peaceful vacation now ended. For what is our life but a ceaseless alternation between trial and rest? You have tasted a little rest; now you return to the arena. Even as Paul toiled, so must you, for the work of the Lord is not a trifle.
But be warned: the path to doing a good job is paved with lowliness, not self-reliance. The whole work is to be ascribed to the power of God, repressing the high-mindedness of those who glory in themselves. Do not enter your classroom boasting of your own skill or the order you will impose. For God resists the proud. Instead, let the matter of your instruction be brief, for there is no need of much teaching, but let the expressions of forbearance be many and close upon one another. Imitate the Master who said, “Learn of me, for I am meek and lowly in heart.”
In this, you will find the true rest you seek. Your soul cries out for rest, and you prayed for it rightly. But know this: the rest God gives is not the idle peace of a vacation, but the calm harbor reached after battling the waves. You will find rest for your soul not by avoiding the labor, but by taking upon you the yoke of Christ within the labor. When you are gentle, when you do not faint and are not benumbed by the ingratitude or slowness of your students, you are reaping the very life of heaven. For who are at rest? Those who follow heavenly wisdom, not those who merely abuse the present life for ease. Return unto thy rest, O my soul, for the Lord hath dealt bountifully with thee, yes, bountifully, even in calling you back to this labor. Let this spirit govern you, and you shall enjoy rest both here and hereafter.