  We construct the full axial current of the constituent quarks by a summation
of the infinite number of diagrams describing constituent-quark soft
interactions. By requiring that the conservation of this current is violated
only by terms of order $O(M_\pi^2)$, where $M_\pi$ is the mass of the lowest
pseudoscalar $\bar QQ$ bound state, we derive important constraints on (i) the
axial coupling $g_A$ of the constituent quark and (ii) the $\bar QQ$ potential
at large distances. We define the chiral point of the constituent quark model
as those values of the parameters, such as the masses of the constituent quarks
and the couplings in the $\bar QQ$ potential, for which $M_\pi$ vanishes. At
the chiral point the main signatures of the spontaneously broken chiral
symmetry are shown to be present, namely: the axial current of the constituent
quarks is conserved, the leptonic decay constants of the excited pseudoscalar
bound states vanish, and the pion decay constant has a nonzero value.
