The Gemara discusses an argument between Rabbi Yehuda and the Chachomim whether one who wrote G-d's name unintentionally (he thought he was writing the name Yehuda and by accident left out the daled) may write over it with the proper intention for it to be a valid writing of G-d's name. The Chachomim do not allow it because "ayn Hashem min hamuvchar" it's not a proper writing for G-d's name. The Gemara goes on to say that this may only be true with regards to a Sefer Torah because of the concept of " zeh Keli veanvehu" this is my G-d and I will glorify Him.
The concept of "zeh Keli veanvehu" is usually applied to making Mitzvos more beautiful, e.g., having a nice Talis, etc. However, the application here is referring to an instance where the beauty is completely hidden from the eye, as one cannot tell whether it was written the first time with the intention of G-d's name or not. This teaches us that sometimes we can beautify the Mitzvos that we do in a completely internal and hidden way and fulfill the concept of "zeh Keli veanvehu". Our initial intention in doing a Mitzvah can make the difference.