'Perfect' in the Bible

Every good thing given and every perfect gift is from above; it comes down from the Father of lights [the Creator and Sustainer of the heavens], in whom there is no variation [no rising or setting] or shadow cast by His turning [for He is perfect and never changes].

For we all stumble and sin in many ways. If anyone does not stumble in what he says [never saying the wrong thing], he is a perfect man [fully developed in character, without serious flaws], able to bridle his whole body and rein in his entire nature [taming his human faults and weaknesses].