We suggest you turn to the Tao Teh Ching:
24. EXCESS He who stretches beyond his natural reach, does not stand firmly upon the ground; just as he who travels at a speed beyond his means, cannot maintain his pace. He who boasts is not enlightened, and he who is self-righteous does not gain respect from those who are meritous; thus, he gains nothing, and will fall into disrepute. Since striving, boasting and self-righteousness, are all unnecessary traits, the sage considers them excesses, and has no need of them. -- tr. S. Rosenthal