Self-will in the man who does not reckon wisely is by itself the weakest of all things.
Aeschylus
I would say raising capital is one of the weakest things for most entrepreneurs.
Robert Kiyosaki
We accumulate our opinions at an age when our understanding is at its weakest.
Georg C. Lichtenberg
If you truly believe in the value of life, you care about all of the weakest and most vulnerable members of society.
Joni Eareckson Tada
'Y' is about the weakest letter of all. 'Y' can't make up its mind if it's a vowel or a consonant, can it?
David Mitchell