"Therefore whoever hears these sayings of Mine, and does them, I will liken him to a wise man who built his house on the rock: and the rain descended, the floods came, and the winds blew and beat on that house; and it did not fall, for it was founded Gothe rock. Now everyone who hears these sayings of Mine, and does not do them, will be like a foolish man who built his house on the sand: and the rain descended, the floods came, and the winds blew and beat on that house; and it fell. And great was its fall." (Matthew 7:24-27)

The above text presents every person in one of two classes: wise or foolish builders. In it, Jesus is encouraging those who had heard His teachings in the Sermon on the Mount to apply them in their lives -- not to be "forgetful hearers" (Jas. 1:22).
Each of us is to be involved in that building process by applying the principles of Scripture to our thoughts and conduct, conforming to the will of God in all things -- even "bringing every thought into captivity to the obedience of Christ" (2 Cor. 10:5). This process is described in Romans 12:1-2, "I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God." The renewed mind one is to have is "the mind of Christ" (Phil. 2:5) which is revealed in the New Testament Scriptures (Heb. 1:1-2). When one allows the gospel to mold and renew his mind, a transformation occurs. He begins to take on the qualities of character that it sets forth that children of God should have. Every Christian must build such a character (2 Pet. 3:18).

We are not speaking of one's reputation. Reputation is what others think you are but character is the person you really are.
There are many standards people in the world use to develop and build character but for the Christian the only correct standard is that which is revealed in the inspired word of God.
Jesus: Our Perfect Standard.