If you have not achieved [continual remembrance of God], you will come to nothing. You will have no success at all in the spiritual life.How do we develop our life so that each moment is filled with the remembrance of God? Here are some suggestions from Saint Theophan:
Meditate more on the divine Creation and Providence.
Concentrate on the Incarnation of God the Word and the matter of salvation
Reflect on His death, resurrection and Ascension into Heaven.
Consider the descent of the Holy Spirit to the Apostles on Pentecost.
Think about the beginning of the Church.
Meditate on the divine attributes of God: goodness, wisdom, omnipotence, justice, omnipresence, all-mightiness, all-knowingness, ever-blessedness, and greatness.
Make your short prayer in praise of God.
Always thank God for everything––even our past misfortunes.
Reference: The Spiritual Life, pp 215-218