When a man becomes liberated?

Sri Ramakrishna (to the devotees): "A man becomes liberated even in this life when he knows that God is the Doer of all things. Once Keshab came here with Sambhu Mallick. I said to him, 'Not even a leaf moves except by the will of God.' Where is man's free will? All are under the will of God. Nangta was a man of great knowledge, yet even he was about to drown himself in the Ganges. He stayed here eleven months. At one time he suffered from stomach trouble. The excruciating pain made him lose control over himself, and he wanted to drown himself in the river. There was a long shoal near the bathing-ghat. However far he went into the river, he couldn't find water above his knees. Then he understood everything (He realized that man is not free even to kill himself, that everything depends on the will of the Divine Mother. ) and came back. At one time I was very ill and was about to cut my throat with a knife. Therefore I say: 'O Mother, I am the machine and Thou art the Operator; I am the chariot and Thou art the Driver. I move as Thou movest me; I do as Thou makest me do.'"

Source: Gospel of Sri Ramakrishna