I am easily attainable by that even steadfast yogi who remembers Me daily and constantly, with a single mind, O son of Pritha. (Bhagavad Gita Chapter 8,14)
He who thinks of Me, the supreme Truth (Bhagavan or God), daily and constantly, not for a few days or a few weeks, but uninterruptedly throughout life, to that yogi who is ever steadfast in thought, I am easily accessible.
Therefore we must always be at it, if we want to succeed. We must always call Bhagavan to mind and not allow other thoughts to interfere.
We must always try to live in the presence of God. It is not sufficient to think of God on Sundays and then forget Him all the rest of the week. To attain God, to reach Him, to enjoy His blessed company, we must be steadfast in our devotion and with a pure and single mind we must call on Him as often as possible. And for the successful yogi it is possible to think of God at all times. Nothing can interfere with that state of communion between God and His devotee. But how to reach that state?
There is a song by the Hindu poet Ramprasad, where the mind is called upon to worship always the Divine Mother of the universe:
Worship the Mother, O my mind, in whatever way you like. Never forget to sing Her praise. When you lie down to rest, think that you are prostrating before the Mother. And when you lie down to sleep, think that you are meditating on Her. When you eat, offer the food to Her. Whatever sound you hear, think that it comes from Her. Recognize Her as the Soul of all beings. If we live thus, we will always remember God.
But we may ask, is it after all worthwhile to go through so much trouble, for, indeed, it is no small matter to think of God always. Yes, the reward is the very highest that can come to man. It means freedom from samsara, liberation from all bondage.
Source - Reflections on the Bhagavad Gita by Swami Atulananda – Prabuddha Bharata December 2003 issue.