Je

Le Mur des "Je t'aime" (The "I Love You" Wall) in Paris, features the words "I love you" written 311 times in 250 different languages.

Source: tatoeba (2090011)

But it's good to use the word "je" as rarely as possible.

Source: tatoeba (2747504)

Every preposition has a definite, fixed meaning, but if we have to use some kind of preposition and the sense doesn't tell us what kind of preposition we should use, then we use the preposition "je", which has no specific meaning.

Source: tatoeba (2758143)

In lieu of the preposition "je" one can also use the accusative without a preposition.

Source: tatoeba (2758925)