A dominant display from the hosts saw them romp to victory as they scored three or more goals for the third time in their five-match winning streak.
"It was a great match," Bielsa told reporters after the game.
"Our superiority is at once consistent and growing. We attacked and defended well. Big wins can bring about an excess of confidence but we'll do our best to keep our feet on the ground.
"It's far too early to talk about the title; we just need to keep doing our thing."
Table-topping OM are next in action when they face fourth-placed Saint Etienne tomorrow.