--Jesus (Luke 9:62, NKJV)
Amy Carmichael* points out that Jesus says looking back, not turning back. (There is a huge difference, isn't there?) When we look back, we can't plow a straight furrow. In other words, we "mess up."
The devil knows that. Thus, he continually tempts us to look back at our past sins, at our worthlessness, at our failures, at the things we want but do not have, at the things we once had but no longer have, at the "good life" others seem to be living....
We must NOT let our thoughts linger on those kinds of things. Instead, we must read God's Word daily and keep our minds focused on the truths it contains (rather than on the devil's lies) as we continue to move forward, fully committed to doing His will.
*author of Thou Givest...They Gather