parshanut torah comment - What's the importance of the Tablets being written with G-d's finger?

"וַיִּתֵּן אֶל־מֹשֶׁה כְּכַלֹּתוֹ לְדַבֵּר אִתּוֹ בְּהַר סִינַי
שְׁנֵי לֻחֹת הָעֵדֻת לֻחֹת אֶבֶן כְּתֻבִים בְּאֶצְבַּע אֱלֹהִים׃" (Ex 31:18)

He gave Moses the two tablets of the Pact, stone tablets inscribed with the finger of God.

What's the importance of "G-d's finger", why it wasn't enough writing "tablets inscribed by God"? Was there anything special about the inscription it had to be made with a finger?