A Faithful Saying
1Tim 4:9 This is a faithful saying and worthy of all acceptance.
The saying he is referring to here is verse 8. There are many places where he refers to "faithful sayings". As such it seems a principle that as he's living the Christian life he's keeping faithful sayings in mind as general guiding principles.
Now just to mention other "faithful sayings" in his writings:
1Tim 1:15 "This is a faithful saying and worthy of all acceptance, that Christ Jesus came into the world to save sinners, of whom I am chief."
1Tim 3:1 "This is a faithful saying: If a man desires the position of a bishop, he desires a good work"
2Tim 2:10-13 "I endure all things for the sake of the elect, that they also may obtain the salvation which is in Christ Jesus with eternal glory. This is a faithful saying: For if we died with Him, We shall also live with Him. If we endure, We shall also reign with Him. If we deny Him, He also will deny us. If we are faithless, He remains faithful; He cannot deny Himself."
Titus 3:5-8 "not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit, whom He poured out on us abundantly through Jesus Christ our Savior, that having been justified by His grace we should become heirs according to the hope of eternal life. This is a faithful saying"