sa tu dirgha kala nairantarya satkara sevito drdha bhumih

Over time continued earnest practice becomes firmly grounded.

Yoga Sutras of Patanjali, 1.14

sa = this
tu = and
dirgha = long
kala = time
nairantarya = continuous
satkara = earnestness
asevito = well attended to
drdha = firm
bhumih = ground

I drew the tree roots to represent firm grounded-ness and the people are doing a balance pose, to represent continued earnest practice.