Have you ever asked someone if they are saved and get the reply of "I used to be saved". There is no such thing as "used to be saved". You either are or you aren't. This type of response shows the level of maturity of the individual who is questioned. I will show you how you will never have to say this again.
Salvation is forever! I believe that when individuals find themselves struggling with sins on a daily basis, they begin to get the mindset of "I used to be saved". The Bible says for us to lay aside every sin and weight that easily beset us. When we don't fellowship with the saints, read God's Word and pray to God daily, our spirit man isn't able to grow and mature. In order to be strengthened, we have to study the Word of God and spend time with God daily. In our time of weakness we should pray to God for strength. You may even get a prayer partner that you can be accountable to.
In order to get the assurance you need about your salvation, take 60 seconds and pray to God so that you can be strengthened and redeemed back to a right relationship with God:
Let the words of my mouth and the meditation of my heart be acceptable in thy sight O Lord my strength, and my redeemer. King James Version
May the words of my mouth and the meditation of my heart be pleasing in your sight, O Lord my Rock and my Redeemer. New International Version
May my spoken words and unspoken thoughts be pleasing even to you, O Lord my Rock and my Redeemer. The Living Bible
In conclusion, when you utilize your kneeling prayer pillow to read God's Word, Pray according to God's Word, Know what God want you to do through revelation, Then Go do what God wants you to do, you will get your strength back. You will no longer say that "I used to be saved". Thank God for salvation, strength and redeeming us.