One verse

Srimad Bhagavatam 4.8.30

4.8.30

अथ मात्रोपदिष्टेन योगेनावरुरुत्ससि । यत्प्रसादं स वै पुंसां दुराराध्यो मतो मम ॥ ३० ॥

atha matropadistena yogenavarurutsasi yat-prasadam sa vai pumsam duraradhyo mato mama

atha
therefore
matra
by your mother
upadistena
being instructed
yogena
by mystic meditation
avarurutsasi
want to elevate yourself
yat-prasadam
whose mercy
sah
that
vai
certainly
pumsam
of the living entities
duraradhyah
very difficult to perform
matah
opinion
mama
my.

Now you have decided to undertake the mystic process of meditation under the instruction of your mother, just to achieve the mercy of the Lord, but in my opinion such austerities are not possible for any ordinary man. It is very difficult to satisfy the Supreme Personality of Godhead.