Swamji said about the Lingams: They are the two eyes of Narayana. They symbolize the unity of the forces of the two hemispheres of the world and the Universe, which is governed by these two cosmic energies, which are the female and the male energy, which makes everything come into manifestation. The two Lingams symbolize these two cosmic energies: Shakti-Shiva, Lakshmi-Narayan, Brahma-Vishnu. Lord Narayana shows that all is present within Him –The Creator, the Protector and the Destroyer is only Him. The big I is only Him. There is no You. Nothing exists other than Him.
Identify yourself with the higher spirit of the cosmic energy which is inside of you. This will help you to burn all your negative karma, pride and ego which is inside of you. This will raise you toward your True Self. Do the Manasa Puja (worship in the mind) inside your mind. Let your mind transcend the duality of what you see. Let it merge into the sublime and know that it is only Him who exists inside of you. So do it through the mind. It is very difficult to control, but not impossible to control. When you sit for meditation, see the Lingam inside and outside of you.