Ephesians 6:11: Put on the whole armor of God, that you may be able to stand against the wiles of the devil.
The words 'put on' here is 'enduo' in Greek, which means 'endue with, clothe in, clothe with, fill your thoughts with, or be filled with'. In other words, to 'put on' the whole armor of God is to 'be conscious of' the whole armor of God! Now what does 'the whole armor of God' mean here? It actually means 'the wholeness, completeness, fullness of God'. Paul was actually saying we are to 'be conscious of the fullness of God', i.e Jesus Christ and His completed work on the cross, the work that's 'perfected forever' (Hebrews 10:14).
Therefore, the armor here actually refers to Jesus Christ Himself, and to 'put on' Christ is to 'be conscious of Christ & His completed work on the cross'. In Ephesians 6:10-17, the breastplate, belt, shoe, shield, helmet, and sword are 'pictures' representing Jesus Christ. You see, He is your righteousness (2 Corinthians 5:21), He is the truth in your life (John 14:6), He is your peace (Isaiah 9:6), He is the author & finisher (beginner & 'completor') of your faith (Hebrews 12:2), He is of course your Savior (Luke 19:10), and He is the Word of God in your life (John 1:14). The 'Word of God' here is itself represented by the 'sword' (Hebrews 4:12).
For example, to 'put on' the 'breastplate of righteousness' means to 'be conscious that you are the righteousness of God in Christ' (being in 'right standing' with God because of what Jesus has done for you on the cross).
The interesting thing here is Paul never said 'dash/fight/strive/toil' in the battle, but he said 'stand' ('be established' in Christ). In fact he wrote three times here.
When you are in Christ,
He is...
-your breastplate (you are protected from condemnation of the devil, reminding you always that you are already 'righteous' in Christ'),
-your belt (you are fastened with the 'truth', and no 'lies' can deceive you),
-your helmet (you are saved from eternal death, and no one can 'knock that off'),
-your shoe (you are led by Him every step of the way, and wherever you go, there'll be peace, as you preach the gospel, touching lives & being a blessing to others),
-your shield (you are filled with the faith of God, and no fear, anxiety or worry can affect you),
-your sword (you are established in the Word of God, which is 'sharper than any other double-edged sword', and it 'overcomes' any work of darkness).