God never forgets his promises. He is faithful to his word. His word is your bond of assurance with all who believe. Your faith is built upon the trustworthy promises of God.
The assurance of your salvation is based completely on trusting the promises of God. The Bible is filled with God's promises. Prayer is successful by simply asking God to do what he has promised. Faithful is God, his promises to perform.
When your faith may seem to be weak, don't focus upon your faith. Focus on the sure and certain promises of God. It is not faith in your faith that counts. It's faith in God's word of promise.
You can have a strong faith. It's not based upon some spiritual secret. Strong faith stands on the solid foundation of God's word of promise. As a believer, God has promised you. His sure word of promise is your bond of assurance.
"God, who cannot lie,
promised before time began."
"For all the promises of God
in Him are Yes, and in Him Amen,
to the glory of God through us."
2 Corinthians 1:20