Sri Chinmoy: You can have deeper meditation through constant remembrance of your goal. Always think of your goal as something high, higher, highest. If your goal is not the highest, if your goal is not boundless Peace, boundless Light, boundless Bliss, then your meditation cannot be very deep. Only when you pitch your aim to the highest, do you go high, higher, highest. If you want to be satisfied with only an iota of Peace, Light and Bliss, then you cannot go deeper; you cannot go higher. Always when you meditate, try to bring into your being boundless Peace, Light and Bliss or throw yourself into something infinite, something vast. These qualities will act like a springboard. If you press hard on the springboard, then you jump higher.
In order to have good meditation you should also try to dedicate your life to the right cause. The right cause is to see the divine in others and the divine in yourself all the time. If you can see yourself only as divine, then you are bound to have a deeper meditation. The moment you think of yourself as a bundle of ignorance, as a sea of ignorance, you are taking the wrong way of approaching the truth. Try to see the divine in yourself as often as you can; then automatically your meditation becomes deeper, more illumining and more fulfilling.