Don't judge others. Always be open to them. Avoid the cult mentality, you know, the super-slick, "I'm superior because I meditate, because I'm on the pathway to enlightenment," the subtle ego nonsense, terrible trap.
Learn not to judge your meditation. Just meditate, do your best, set a minimum period of time and meditate.
Don't judge your meditations. Don't rate them. The physical mind cannot tell how well you did. As long as you are sitting there trying, something will happen.
Advance yourself by advancing others. Do not judge others. Be of service to them, but realize that you are not necessarily the instrument of perfecting and immortalizing others.
The one thing you can give God that will truly impress God is freindship. God is an eternal companion who is with you all the time - never judges, just is.