Reliability is a part of God's character. It's in the Bible, Psalm 33:4, NIV. "For the word of the Lord is right and true; He is faithful in all He does." Hebrews 13:5, NIV says, "God has said, 'Never will I leave you; never will I forsake you.'"
Browse: What is the fruit of the Spirit?
Christians can be relied on to follow the truth at all times. It's in the Bible, Ephesians 4:15-16, TLB. "Instead, we will lovingly follow the truth at all times—speaking truly, dealing truly, living truly—and so become more and more in every way like Christ who is the Head of His body, the church."
Salvation is promised to the faithful. It's in the Bible, Matthew 10:22, NIV. "All men will hate you because of Me, but he who stands firm to the end will be saved."
The Lord is looking for faithful and reliable servants. It's in the Bible, Matthew 24:45, TLB. "Are you a wise and faithful servant of the Lord? Have I given you the task of managing my household, to feed my children day by day? Blessings on you if I return and find you faithfully doing your work. I will put such faithful ones in charge of everything I own!"
God promises strength to be faithful even unto death. It's in the Bible, Revelation 2:10, NIV. "Do not be afraid of what you are about to suffer. I tell you the devil will put some of you in prison to test you, and you will suffer persecution for ten days. Be faithful, even to the point of death, and I will give you the crown of life."