Oh? And doesn't God guide those that seek him toward him anyway?
He does, but This is Not accomplished by sending an angel to sprinkle magic pixie dust on you while you sleep. For all those who earnestly seek Him, He will be found in the writings of Paul.
Jesus also commented that rich man would have a hard time getting into heaven and that he came to tear families apart. Paul's message seems counter to that, even if it is easier to follow.
Rich men Generally do have a hard time getting into Heaven, especially back then. Because in order for someone to become wealthy it was at the expense of others. This type of behavior runs contrary to what it takes to have a relationship with God. Paul does not disagree here.
Jesus was also correct when He said that, He would be the reason families would be torn apart. Paul clarifies and says, that even if your family is torn apart by your belief in Jesus this does not stop your responsibility to them.. Unless they Leave you, if they decide togo we are supposed to let them leave.
Again there was enough freedom in the principle Jesus spoke, to let a fool or someone young at heart to be wronged by a family member, and assume that the natural reaction is to hurt back.
Primarily because there isn't a direct correlation between "turn the other cheek" and "I am here to drive families apart." People weren't making that connection on their own. So Paul connects the dots for them. Following the teachings of Jesus alone will allow someone to self righteously justify just about anything they want. What the fool or young in spirit often don't see is the fragile nature of the relationship on which God's freedom is built.
Why Paul then? Why not one of the disciples that followed Jesus?
I can't say, because the bible is silent there.. Maybe it was always supposed to be Paul, but at the time of Jesus's ministry "Saul" was not ready to be a disciple. And/or Perhaps it took an ex-Pharisee (Someone use to being under the law) to be able to comprehend the depths needed to bridge those gaps between the simple teachings of Jesus and the underlining wisdom.
No, I hear more of Paul's teachings because that is where I'm directed to by Christians and it's where Christians get many of their quotes when referring to how to live.
If you seek direction as to how to live, then you currently do not understand or have a solid relationship with the Holy Spirit. Which means you, are spiritually only able to comprehend the written teachings you have received. To "hear" more of what Jesus taught is a gift, and not an academic exercise.
We quote Paul because His words are usually very direct, and to the point. The words of Christ are open and will serve the purposes of any Heart. For those who come to Him as a Child, they will find a savior. For the self serving, they will find what ever it is they seek.