只

zhi

only, just; single; 

形单影只 "lonely with just one shadow"

a mouth (口), instead of eight (八) unconvincing excuses, should provide JUST a SINGLE justification

纟

si

thread / thread silk

织

zhi

to weave, to knit

组织 "to organize" → lit. "weave a structure"

silk threads (纟) is JUST (只) what one needs for weaving or knitting

识

shi

to know/recognize

knowledge

识字 to read/literacy; 知识 knowledge; 识别 to distinguish, to identify

words (讠) are JUST (只) enough to recognize or to know how eloquent one is