In the discussion below, Kevin argues that a single guy should not be looking for a wife, per se, but should be looking to find the will of God. Of course I agree with that. But the question then arises, how does he know the will of God in this area? In most areas of life, there is no "default setting"--if you are not married, you are single; if you are not keeping yourself open to getting married, you are committing yourself to staying single for the indefinite future. Which one should it be?
The primary place to go to find the will of God is not our feelings or impressions of what God might be saying to us. (Some might say we should never look there. I'll leave that argument for the more learned.) We can all agree that the primary place to know the will of God is from the Bible.
Now of course there is no passage that says, "Thou shalt get married"; as Paul says, every one has their own gift from God. But that does not mean the Bible gives no further guidance on the topic. Starting in the first two chapters of Genesis, we see that God does not think it good for a man to be alone and that the first command he gives to humans is to be fruitful and multiply, an activity that requires two. Throughout the Scripture we see that the exhortations to marry are applied to broad groups of people over broad swaths of time for reasons tied into human nature (Jeremiah 29:6, I Corinthians 7:2, I Timothy 5:14). Singleness is spoken of as an exception, given to specific people for specific purposes or circumstances (Jeremiah 16:1-4, Matthew 19:10-12, I Corinthians 7:26).
So which should be considered the default? My argument is simply that, unless God gives specific direction otherwise, Scripture indicates that His will is marriage. Now of course when and how that happens requires further seeking of God's guidance. We are also permitted to use our brains and look to how God has made things to help us discern His will on timing. One of the primary purposes for marriage, having kids, can only be accomplished when one is young; another, avoiding fornication, is at least more pressing when one is young. Therefore, one can deduce that God's will--usually, unless indicated otherwise--would be for marriage to occur sooner rather than later.
I'm not saying that somebody better be out scoping out women day and night or else they are sinning; on the other hand, we shouldn't have the mentality of the guy stuck to the top of his roof in the flood who turned down all passing boats and helicopters because he was trusting the Lord. In the vast majority of cases, God works through the actions of people. Including our own.
I think a very close analogy to marriage would be the matter of work. Like marriage, we can see that God made man to work from the very beginning (Genesis 2:15) and that the general command is to work in order to obtain what we need. (Genesis 3:19, 2 Thessalonians 3:10, Ephesians 4:28) On the other hand, there are certainly times and places where God provides people's needs without their labor (I Kings 17:4) or where he even commands people to rely on the generosity of others to provide for them (Mark 6:8). But most of us realize that unless God gives us specific direction in that area, we ought to be working to take care of ourselves, while trusting God to take care of us even if we are unable to obtain work.
Look at it like this: Suppose you came across an able-bodied man and asked him where he was working these days. "I'm not," he says.
"Oh, are you going to school? Or doing some ministry?"
"No, I don't think that's where God wants me."
"Are you looking for a job, then?" you ask, at last.
"No, I'm praying about whether God wants me to look for a job, but so far He hasn't lead me to. So I'm just sitting around until He tells me what to do next."
Now it's possible that he might have some good reason you haven't asked about. But would it be out of bounds to say that something smells a little fishy there?