Most people always have a question why one easily falls back to sin after having gone for repentance. Most people have argued it out and many more still will come to argue it out that man is prone to sin. I would not really conquer with them nor refute their ideas for they believe that. Rather I would wish to evaluate this from using a lens of vacation.
A vacation is an extended period of recreation, especially one spent away from home or in traveling or the action of leaving something one previously occupied as mostly described on the net or the dictionary. Defining it etymologically would draw us back to a Latin word “vacare” meaning “to be empty” and would be the colour of my lens.
Many times when we go for the sacrament of penance, we take a vacation from sin and in so doing have emptied ourselves of sin. We forget that the space left vacant has to be filled with God’s grace and love. We move on back to our secular world without first filling that empty space. This has to be occupied so as to prevent the day-to-day fall into sin. One might then go ahead to challenge me by asking why some people still sin when they are sure that the space has been filled. My answer is simple, the space is “half-filled” and only full-filled by God.
And unless we always come back to the Father and allow Him to half-fill us as we live, for we know we shall be full-filled when we see Him as He really is, we are prone to always fall back into sin. I would implore you to always try to ask for God’s grace to always get up when we fall.