This is one of the Gita's sweetest verses. Krishna says: for the one who thinks of Me with undivided heart, constantly and without fail — I am easy to reach.
"Sulabhah" — what a tender word. God himself is saying: I am not difficult. I am not far away. I am not hidden behind impossible austerities. The one who remembers Me sincerely — for that person, I am sulabh, readily available. A mother is always near her child. The child simply has to call.
The condition is twofold: "ananyachetah" — the mind does not chase after other things — and "satatam" — the remembrance is continuous. Morning and evening, while working and while resting — keeping God's name alive in the heart. That is all it takes.