In dating, we choose our potential "mate" based on our first impressions of that person mainly because we do not know them, yet. There is something that attracts us whether it is appearance, personality, or the person we perceive them to be. The best advice I've heard lately came from my best friend's mother. She says, "start out like you can hold out."
I cannot speak for men, but as a woman, I have a mental checklist of certain things that I look for upfront. Obviously, he should be easy on the eyes, a "manly" man (wimps need not apply), easy-going personality and a sensible humor (no silliness) is always a plus. These are things you can pick up on within moments of meeting a person. Character traits, however, are those characteristics that may not be immediately evident. These qualities, or the lack thereof, may not become apparent until prompted by an event. For example, a quick temper may not be revealed until the person becomes stressed or irritated. By the same token, a good temperament is not usually visible until a situation requires a good attitude or patience, like waiting in a long line, or perhaps the experience of a new server at your favorite restaurant.
Often times, we may see a glimpse of something "a little off" in a person, but we think Well, I really like this or that about him, so I can deal with this. Take the good with the bad. Let me tell you from personal experience. If he is cheating now, he will cheat later; a little rough now, he will be a lot rougher later; a little perverted now, a lot perverted later; drinks a little too much now, will drink way too much later. It is the nature of the beast, if you will. Even the simple things like your interests can be complex things later. For instance, if you are a gal that hates sports, it is probably not wise to date a sports fanatic. This could really become a huge issue later. Solomon refers to "the little foxes that spoil the vines." (Song of Solomon 2:15) Start out like you can hold out.
When it comes to your faith, you have to be on the same level. Yes, God can save anyone. Yes, it is His will "that none should perish, but that all should come to repentance." (2 Peter 3:9) However, dating someone who does not have the same level of faith, the same moral conduct we as Christians are to live by, can be absolutely disastrous. The biggest misconception is that we believe in our heart of hearts that our lifestyle will be a witness and they will want what we have and desire what we desire. I would say 9 out of 10 times, we are the ones who end up compromising. Typically, this doesn't happen over night, but rather little by little. The slow fade until we wake up one day thinking, How the heck did I get here?
Please use caution when you hear phrases like, I know the Bible from front to back, but... Although a sad one, it is a fact that many Christians who have walked with the Lord their whole lives know very little of the Bible, much less cover to cover. Anyone who spends a lot of time studying the Word will tell you that no matter how many times they've read the Bible through, they always find something they have never seen before. That is because, the Word is a living Word. It is, in fact, illuminating and revealing with every stage of growth. There have been many times I would read a passage I've read numerous times before and all of a sudden...revelation knowledge. I will see it in a way I've never seen it before. So, do not be deceived. Judge the fruit. There are people without a reverential fear and they will use the guise of holiness to entrap you. In Matthew 23:27-28, Jesus referred to the teachers of religious law and the Pharisees as "Hypocrites!" He rebuked them saying "You are like whitewashed tombs—beautiful on the outside but filled on the inside with dead people’s bones and all sorts of impurity. Outwardly you look like righteous people, but inwardly your hearts are filled with hypocrisy and lawlessness." Psalm 10:7-10 records a startling warning:
His mouth is full of cursing and deceit and oppression; Under his tongue is trouble and iniquity. He sits in the lurking places of the villages; In the secret places he murders the innocent; His eyes are secretly fixed on the helpless. He lies in wait secretly, as a lion in his den; He lies in wait to catch the poor; He catches the poor when he draws him into his net. So he crouches, he lies low, That the helpless may fall by his strength.
Eventually, who we are down deep will come out. The real person may not surface for quite some time while others may be revealed within minutes. Our greatest defense against this type of entrapment is prayer. Watch and listen. Know this, ALL things, good and bad, will be revealed with time for this is the law of God.
Luke 8:17 "For all that is secret will eventually be brought into the open, and everything that is concealed will be brought to light and made known to all."