Havamal Snippets 89: Do not put your trust in damaged things

I have no idea what this stanza is about other than 'things not to trust'.  Any insight would be useful.

89

Bróðurbana sínum

þótt á brautu mœti

húsi hálfbrunnu

hesti alskjótum

þá er jór ónýtr

ef einn fótr brotnar

verðit maðr svá tryggr

at þessu trúi öllu

In his brother-slayer,

though he is met on the road,

in a half-burnt house,

in a horse too-speedy --

a steed is useless

if he breaks a foot --

a man should not be so trustful

that he trusts all these.

[End.]