Single responsibility principle violation in PHP

SRPViolation.php

<?php

class Logger
{
    public function __construct(\PDO $pdo)
    {
        $this->pdo = $pdo;
    }

    public function log($message)
    {
        $this->persist($message);
    }

    private function persist($message)
    {
        $sql = "INSERT INTO logs(:message)";
        $stmt = $this->pdo->prepare($sql);

        $stmt->bindParam(':message', $message, PDO::PARAM_STR);
        $stmt->execute();
    }
}