How did St. John of Dalyatha practice silent prayer without ceasing?

St. John of Dalyatha³¹² says, “Blessed is the one who forgets about worldly converse to speak with You, for all his needs are filled by You. You are his food and drink; You are his joy and his exultation. You are his garment, in your glory his nakedness is clothed (cf. 2 Cor. 5:3). You are his dwelling and his resting place, and he always goes within You to be protected. You are his sun and his day, and in your light he sees hidden mysteries. You are the father who generated him, and like a child he calls You: Father ! (Rom. 8:15). You placed the Spirit of your Son in his heart (cf. Rom. 5:5; 2 Cor. 1:22).”³¹³