Read Matthew 14:28-33: 28 Peter answered him, "Lord, if it is you, command me to come to you on the water." 29 He said, "Come." So Peter got out of the boat, started walking on the water, and came toward Jesus.30 But when he noticed the strong wind, he became frightened, and beginning to sink, he cried out, "Lord, save me!" 31 Jesus immediately reached out his hand and caught him, saying to him, "You of little faith, why did you doubt?" 32 When they got into the boat, the wind ceased. 33 And those in the boat worshiped him, saying, "Truly you are the Son of God." (NRSV)
"If you are I AM, then give me the power to do what you are doing," was basically what Peter said to Jesus. Peter wanted to walk on water. And as long as Peter kept his eyes on Jesus, he was able to accomplish what no one else has. When Peter realized that he was indeed walking on water and choppy water at that, he took his eyes off Jesus and began to sink and called out to Jesus.
When we call on Jesus to come to us, we are really responding to Jesus' call to come to Him. Something we must always do; for without Jesus we're nothing and we can do nothing.
PRAYER: Lord, help me to always call on You. May I always keep my eyes on You. In Jesus I pray, amen.