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Sé la verdad.

Sé la verdad.
I know the truth.
From Lesson 33:Irregular first-person verbs·Spanish (Spain)

Questions & Answers about Sé la verdad.

Why is "I know" translated as Sé? What is the infinitive?
Sé is the irregular "I" form (first-person singular) of the verb saber (to know a fact or piece of information). Instead of following the normal present tense rules, this form changes completely, so you just have to memorize that yo sé means "I know".
Why does Sé have an accent mark?
The written accent mark is there to distinguish the verb sé (I know) from the pronoun se (which you might remember from reflexive verbs, like in él se llama). Both words are pronounced exactly the same way, so the accent mark prevents confusion in writing.
How do we know to use la with verdad?
Verdad (truth) is a feminine noun. A very reliable rule in Spanish is that nouns ending in -dad are almost always feminine, which is why it takes the feminine word for "the", la.
Where is the word for "I" in this sentence?
The Spanish word for "I" is yo, but it is left out here. Because the verb form sé can only possibly mean "I know", the subject is already perfectly clear. You would only add yo (Yo sé la verdad) if you wanted to add emphasis, like pointing out that you know the truth even if others do not.

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