Mathew 26:40-41
"Then he returned to his disciples and found them sleeping. 'Could you men not keep watch with me for one hour?' he asked Peter. "Watch and pray so that you will not fall into temptation. The spirit is willing, but the body is weak."
Prayerless disciples ...
The disciples didn't pray with the Saviour in Gethsemane. Following were the consequences:
1. Flesh takes over the spirit Mathew 26:51 "...One of Jesus' companions reached for his sword, drew it out and struck the servant of the high priest, cutting off his ear."

Though the disciples ministered along with Jesus Christ, when they lacked prayer, circumstances influenced their character. Jesus had taught his disciples to love their neighbours as themselves, and to even love their enemies. But the disciples disobeyed His teaching when they didn't pray. Infact Jesus had even told them so many times that He would soon be handed over into the hands of sinful men to be crucified. But they failed to grasp that as they were not watchful in prayer. Their flesh overtook their spirit.
2. Going away from God
Mathew 26:56 "...Then all the disciples deserted him and fled.".
Mathew 26:56 "...Then all the disciples deserted him and fled.".
Prayer keeps us close to God. When we lack in prayer we will also flee from the Lord.
3. Witnessing for Christ becomes hard
Mathew 26:69-70 "Now Peter was sitting out in the courtyard, and a servant girl came to him. 'You also were with Jesus of Galilee,' she said. But he denied it before them all."
Witnessing for Christ before men becomes hard when we lack in prayer.
Prayerful disciples ...
The same disciples realized what they were lacking and started praying.
Acts 1:14 "They all joined together constantly in prayer ..."
When they prayed together in the upper room, the Holy Spirit filled them and they started witnessing boldly for Christ! In the name of Jesus, Peter was able to bring healing to the lame man sitting at the gates of the temple. They started performing many miracles and signs to bring glory to God.
What a great difference between a prayerless life and a prayerful life! So pray ...