Spiritual DNA?

Jesus said something that really troubles me. He said a lot of people who claim to be his children are not going to be allowed into heaven. Considering the source of the information, it must be true. But who are these people and more importantly, could I be one of them? Jesus explained to the people of his day:
MT 6:22 "The eye is the lamp of the body. If your eyes are good, your whole body will be full of light. 23 But if your eyes are bad, your whole body will be full of darkness. If then the light within you is darkness, how great is that darkness!

MT 6:24 "No one can serve two masters. Either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve both God and Money.

Before we start judging each other’s actions, let’s remember: MAN judges the outward appearance but GOD judges the heart. The standard for entrance into heaven is found in the heart. Is it the true will of the heart to forsake all and lean only on Him? Forget for a second what the body does. What is it that you truly, deeply want to do? Sure we confess sins and accept forgiveness, but that largely is to escape consequence, either now or in eternity. What we need to ask ourselves is, are we really sincere and earnest? Do we really desire to be obedient, (fleshly action is not the subject here, the heart’s desire is). Paul said in Romans 7 we would have trouble with the flesh even when the heart is right. The real question I must ask myself is “Do I truly want to be obedient?” Does the dna of my heart match the dna of His?