BismIllah wa as salaamu alaykum wa Rahmat Allah wa Barakatuh.
Most of us know, not just adults but children as well, that it really doesn't matter what someone says if their actions contradict it. After all, if someone tells you that you are highly valued and precious to them but then takes advantage of you, doesn't fulfill their promises and commitments to you and yet bends over backwards to lavish favors and things on others, will you believe them?
I call it the addition rule: everything should add up. One plus one should equal two.
i.e.: I say something (1), + my actions back it up (1), then it is, bi ithn Illah, true (=2).
Similarly, if a brother or a sister says they are practicing Islam and fear Allah, and yet aren't praying or following Allah's guidance and examples, will you believe them? Practicing islam and taqwa (1) + no prayers or practice (-1) = 0 on the truth scale.
There is so much value in being true to others, but we cannot be true to others unless we are true to ourselves. You may think that you can hide the truth from others, but Allah may
expose what you thought would never come to light. Don't take that
chance. Don't be a liar to yourself, because in turn you will be a liar to others, and worse of all, you will be a liar in the Eyes of Allah.