Philippines 3:12 Not that I have already attained, or am already perfected; but I press on, that I may lay hold of that for which Christ Jesus has also laid hold of me.
Philippines 3:13 Brethren, I do not count myself to have apprehended; but one thing I do, forgetting those things which are behind and reaching forward to those things which are ahead,
Philippines 3:14 I press toward the goal for the prize of the upward call of God in Christ Jesus.

When you look back you are in your own power. When you Look up to Jesus you are now Dwelling and Living in His Love and Power!
Philippines 4:13 I can do all things through Christ who strengthens me.

Faith means you are Abiding and looking forward to the Promises of God Almighty’s Divine Word. You are instructed in The Bible to Live in Faith.
Hebrews 10:38 Now the just shall live by faith; But if anyone draws back, My soul has no pleasure in him.”

As long as your eyes and heart are on The Lord Jesus Christ and His Divine Word you will be walking and Abiding in Him always!

Psalm 119:105 Your word is a lamp to my feet And a light to my path.

Hebrews 11:1 Now faith is the substance of things hoped for, the evidence of things not seen.

When you look back at the past mistakes and sorrows you are not Abiding in Him, you are relieving the past and sorrows. It is impossible to change the past. No where in The Bible Has God Almighty changed the past. You can change your present and future with you Abiding and looking to The Lord Jesus Christ. The Past is dead, Looking to Jesus is Alive with a life full of Abundant Joy and His Divine Love Over flowing in you!

2 Corinthians 5:17 Therefore, if anyone is in Christ, he is a new creation; old things have passed away; behold, all things have become new.

The devil will always have you look back to bring condemnation and sorrows to defeat you and steal your Blessings from The Lord Jesus Christ.

2 Corinthians 11:3 But I fear, lest somehow, as the serpent deceived Eve by his craftiness, so your minds may be corrupted from the simplicity that is in Christ.

Hebrews 11:6 But without faith it is impossible to please Him, for he who comes to God must believe that He is, and that He is a rewarder of those who diligently seek Him.