One of the most important things that we can do to become strong in the Lord is to get His Word inside of us. Learn to personalize God's word!
Paul said in Col 3:16 to "Let the word of Christ dwell in you richly in all wisdom...."
John said in 1 John 2:14b "...I have written to you, young men, because you are strong and the word of God abides in you, and you have overcome the wicked one."
Notice: They were strong. Why? The word of God abided in them.
The Result: They overcame the wicked one.