I think we would do well to clarify our terminology when it comes to asking about whether something is spiritual or not. The world often sees “spiritual” as a mystical quality inherent in certain activities or persons. So the mystical neighbour with the yoga mat is considered spiritual, but the engineer on the other side who plays football and enjoys soft rock anthems is not considered spiritual.
Then there is a semi-Christian version of the word which basically uses it as a synonym for sanctified behaviour. So it is not describing a quality of spirituality being present in something, but rather it just means whether it is appropriate Christian behaviour or not. In this way of thinking it is “spiritual” to pray, but it is not “spiritual” to go and watch the football game.
So let’s consider the issue of sermon preparation. Is it spiritual? Some, with the semi-Christian understanding of the word might affirm that it is spiritual to prepare a sermon – it is appropriate Christian behaviour for a pastor. Others, with a Christianized version of the first, more mystical, concept, might argue that it is not spiritual to prepare a sermon. Better, they might say, to disengage yourself from study and just rely on inspiration in the moment.
What if we cast off confusing misappropriations of the term and think in genuinely biblical terms. What constitutes “spiritual” in the New Testament? Is it not the presence or absence of the Holy Spirit? If that is the “top and bottom” of the issue, then we would have to say that either neighbour could be spiritual, or maybe completely devoid of the Spirit. And praying or watching football could be spiritual, or could also be completely devoid of the Spirit. And we would have to say that either preparing a sermon or choosing not to prepare a sermon could be spiritual, or completely devoid of the Spirit.
I do not doubt that God, by His Spirit, may work wonderfully if I am called on to preach without a moment to prepare. However, I do wonder at the wisdom of abdicating my role as a steward of the ministry if I were to decide to preach as if it were somehow more spiritual to not prepare at all.
My vote would absolutely be on the side of preparing. Wayne McDill, in his 12 Essential Skills for Great Preaching (p219), wrote, “The fact is that God has decided to use preachers. Our laziness does not help the Holy Spirit; it hinders him. There is nothing particularly spiritual about poor sermon preparation.”
However, preparation is not automatically spiritual, either. Is my confidence in my preparation, my homiletical skill, my gifting, my knowledge, my view of preaching, my teachers, my books? Or is my heart reliant on God, my mind humbly subject to God’s instruction, my attitude one of humility before the Word of God, etc.? My suspicion is that whether my preparation is spiritual or not will be evident in my prayer. It will be known to God and probably more obvious to my listeners than I might think (especially if I am functioning in a state of self-confidence).
If you are asked to preach, prepare. Prepare humbly. Prepare prayerfully. Prepare as if “apart from me, you can do nothing.”