Charles Spurgeon said, "Temporary faith is no faith at all." Jesus spoke of "those who believe for awhile, and in time of testing fall away" (Luke 8:13). Abiding faith can stand the test. Also, true saving faith is an abiding gift of the Holy Spirit (1 Corinthians 13:13). Abiding faith endures through all manner of testing.
Jesus taught that there are people with temporary faith, who only believe for awhile. This is recorded in the Parable of the Sower (Luke 8:11-15). The problem in this case is recognized in the person's heart. Temporary faith has to do with a heart not changed by the grace of God. It leads to apostasy, or falling away.
When you are born again, God takes away your heart of stone and gives you a new heart (Ezekiel 36:26). Your new heart is like rich soil for the seed of the Gospel of Christ to bring forth fruit unto salvation. Abiding faith has a heart changed to become a new creation in Christ (Romans 2:28-29; 2 Corinthians 5:17). Abiding faith, unlike temporary faith, is a gift of the Spirit of God that overcomes the world (1 John 5:4).
When you are saved by the grace of God, your heart is changed with new desires. Your heart is the mind, will, and emotions, as the term is most often used in the Bible. God works in us "both to will and to do for His good pleasure" (Philippians 2:13). A new heart includes your will changed by God's grace. God began the work of salvation in you and completes it (Philippians 1:6). Abiding faith endures to receive complete salvation in Christ.