The Seal Must Not Be Forged
Truth is Hashem's seal, and a seal that has been counterfeited no longer proves anything.
Chazal teach that the seal of Hashem is truth. The Yehudi pointed out a quiet warning inside that image. A seal only has worth when it is genuine, and the moment someone forges it, the truth is gone from it. So a person must keep examining why he does what he does. If he finds that his motives are bent, with a wish to look impressive or to be admired, he should not simply carry on. He should think the matter through until the motive is clean again. A mitzvah done for show may look perfect from outside, but it carries no seal. What Heaven wants is the real thing, even when the real thing is smaller and plainer.
Source: Tiferes HaYehudi (Kosov, 1912), p. 50, compiled by Baruch of Kasov.
Pick one thing you will do today that other people will see, such as davening, giving tzedakah or helping at home. Before you start, ask yourself quietly what is really pushing you to do it. If part of the answer is wanting credit, do not stop. Just add the true reason, that Hashem asked for it, and say it to yourself in a single sentence. Then do the act as plainly as you can, and notice how it feels.